Stantec

Line Label Object Class Period Type Balance Report Element Name
1 0000001 - Document - Cover Page Network

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 http://www.stantec.com/role/CoverPage
2 Cover [Abstract] Abstract dei:CoverAbstract
3 Entity Addresses [Table] Table dei:EntityAddressesTable
4 Entity Addresses, Address Type [Axis] Axis dei:EntityAddressesAddressTypeAxis
5 Address Type [Domain] Abstract dei:AddressTypeDomain
6 Business Contact Abstract dei:BusinessContactMember
7 Entity Addresses [Line Items] LineItems dei:EntityAddressesLineItems
8 Document Type Concept (Submission Type) For Period dei:DocumentType
9 Document Registration Statement Concept (Yes/No) For Period dei:DocumentRegistrationStatement
10 Document Annual Report Concept (Yes/No) For Period dei:DocumentAnnualReport
11 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
12 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
13 Entity File Number Concept (dei:fileNumberItemType) For Period dei:EntityFileNumber
14 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
15 Entity Incorporation, State or Country Code Concept (dei:edgarStateCountryItemType) For Period dei:EntityIncorporationStateCountryCode
16 Entity Primary SIC Number Concept (dei:sicNumberItemType) For Period dei:EntityPrimarySicNumber
17 Entity Tax Identification Number Concept (dei:employerIdItemType) For Period dei:EntityTaxIdentificationNumber
18 Entity Address, Address Line One Concept (Text/String) For Period dei:EntityAddressAddressLine1
19 Entity Address, Address Line Two Concept (Text/String) For Period dei:EntityAddressAddressLine2
20 Entity Address, City or Town Concept (Text/String) For Period dei:EntityAddressCityOrTown
21 Entity Address, State or Province Concept (dei:stateOrProvinceItemType) For Period dei:EntityAddressStateOrProvince
22 Entity Address, Country Concept (dei:countryCodeItemType) For Period dei:EntityAddressCountry
23 Entity Address, Postal Zip Code Concept (Text/String) For Period dei:EntityAddressPostalZipCode
24 City Area Code Concept (Text/String) For Period dei:CityAreaCode
25 Local Phone Number Concept (Text/String) For Period dei:LocalPhoneNumber
26 Contact Personnel Name Concept (Text/String) For Period dei:ContactPersonnelName
27 Title of 12(b) Security Concept (dei:securityTitleItemType) For Period dei:Security12bTitle
28 Trading Symbol Concept (dei:tradingSymbolItemType) For Period dei:TradingSymbol
29 Security Exchange Name Concept (dei:edgarExchangeCodeItemType) For Period dei:SecurityExchangeName
30 Annual Information Form Concept (Yes/No) For Period dei:AnnualInformationForm
31 Audited Annual Financial Statements Concept (Yes/No) For Period dei:AuditedAnnualFinancialStatements
32 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
33 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
34 Entity Interactive Data Current Concept (Yes/No) For Period dei:EntityInteractiveDataCurrent
35 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
36 ICFR Auditor Attestation Flag Concept (Yes/No) For Period dei:IcfrAuditorAttestationFlag
37 Document Financial Statement Error Correction [Flag] Concept (Yes/No) For Period dei:DocumentFinStmtErrorCorrectionFlag
38 Document Financial Statement Restatement Recovery Analysis [Flag] Concept (Yes/No) For Period dei:DocumentFinStmtRestatementRecoveryAnalysisFlag
39 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
40 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
41 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
42 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
43 0000002 - Document - Audit Information Network

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 http://www.stantec.com/role/AuditInformation
44 Audit Information [Abstract] Abstract stn:AuditInformationAbstract
45 Auditor Name Concept (dei:internationalNameItemType) For Period dei:AuditorName
46 Auditor Location Concept (dei:internationalNameItemType) For Period dei:AuditorLocation
47 Auditor Firm ID Concept (dei:nonemptySequenceNumberItemType) For Period dei:AuditorFirmId
48 0000003 - Statement - Consolidated Statements of Financial Position Network

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 http://www.stantec.com/role/ConsolidatedStatementsofFinancialPosition
49 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
50 ASSETS Abstract ifrs-full:AssetsAbstract
51 Current Abstract ifrs-full:CurrentAssetsAbstract
52 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
53 Trade and other receivables Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
54 Unbilled receivables Concept (Monetary) As Of Debit stn:UnbilledReceivables
55 Contract assets Concept (Monetary) As Of Debit ifrs-full:CurrentContractAssets
56 Income taxes recoverable Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssetsCurrent
57 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
58 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherCurrentAssets
59 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
60 Non-current Abstract ifrs-full:NoncurrentAssetsAbstract
61 Property and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
62 Lease assets Concept (Monetary) As Of Debit ifrs-full:RightofuseAssets
63 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
64 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
65 Net employee defined benefit asset Concept (Monetary) As Of Debit ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan
66 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
67 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
68 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
69 LIABILITIES AND EQUITY Abstract ifrs-full:EquityAndLiabilitiesAbstract
70 Current Abstract ifrs-full:CurrentLiabilitiesAbstract
71 Bank indebtedness Concept (Monetary) As Of Credit ifrs-full:BankOverdraftsClassifiedAsCashEquivalents
72 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
73 Lease liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLeaseLiabilities
74 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:CurrentContractLiabilities
75 Income taxes payable Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
76 Long-term debt Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
77 Provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
78 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
79 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
80 Non-current Abstract ifrs-full:NoncurrentLiabilitiesAbstract
81 Lease liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLeaseLiabilities
82 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
83 Provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
84 Net employee defined benefit liability Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
85 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
86 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
87 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
88 Shareholders’ equity Abstract ifrs-full:EquityAbstract
89 Shareholders’ equity Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
90 Total liabilities and equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
91 0000004 - Statement - Consolidated Statements of Income Network

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 http://www.stantec.com/role/ConsolidatedStatementsofIncome
92 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
93 Gross revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
94 Less subconsultant and other direct expenses Concept (Monetary) For Period Debit stn:SubconsultantSubcontractorAndOtherDirectExpenses
95 Net revenue Concept (Monetary) For Period Credit stn:NetRevenue
96 Direct payroll costs Concept (Monetary) For Period Debit ifrs-full:CostOfSales
97 Project margin Concept (Monetary) For Period Credit ifrs-full:GrossProfit
98 Administrative and marketing expenses Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
99 Depreciation of property and equipment Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
100 Depreciation of lease assets Concept (Monetary) For Period ifrs-full:DepreciationRightofuseAssets
101 Amortization of intangible assets Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
102 Net interest expense and other net finance expense Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
103 Other income Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
104 Income before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
105 Income taxes Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
106 Current Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
107 Deferred Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
108 Total income taxes Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
109 Net income for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
110 Earnings per share, basic (in cad per share) Concept (dtr-types:perShareItemType) For Period ifrs-full:BasicEarningsLossPerShare
111 Earnings per share, diluted (in cad per share) Concept (dtr-types:perShareItemType) For Period ifrs-full:DilutedEarningsLossPerShare
112 0000005 - Statement - Consolidated Statements of Comprehensive Income Network

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 http://www.stantec.com/role/ConsolidatedStatementsofComprehensiveIncome
113 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
114 Net income for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
115 Other comprehensive (loss) income Abstract ifrs-full:OtherComprehensiveIncomeAbstract
116 Items that may be reclassified to net income in subsequent periods: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
117 Exchange differences on translation of foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
118 Net unrealized gain on financial instruments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
119 Total items that may be reclassified to net income in subsequent periods Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
120 Items not to be reclassified to net income: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
121 Remeasurement gain on net employee defined benefit plans Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
122 Other comprehensive (loss) income for the year, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
123 Total comprehensive income for the year, net of tax Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
124 0000006 - Statement - Consolidated Statements of Shareholders' Equity Network

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 http://www.stantec.com/role/ConsolidatedStatementsofShareholdersEquity
125 Statement of changes in equity [abstract] Abstract ifrs-full:StatementOfChangesInEquityAbstract
126 Statement of changes in equity [table] Table ifrs-full:StatementOfChangesInEquityTable
127 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
128 Equity Abstract ifrs-full:EquityMember
129 Equity attributable to owners of parent Abstract ifrs-full:EquityAttributableToOwnersOfParentMember
130 Shares Outstanding/Share Capital Abstract ifrs-full:IssuedCapitalMember
131 Contributed Surplus Abstract ifrs-full:AdditionalPaidinCapitalMember
132 Retained Earnings Abstract ifrs-full:RetainedEarningsMember
133 Accumulated Other Comprehensive Income (Loss) Abstract ifrs-full:AccumulatedOtherComprehensiveIncomeMember
134 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
135 Beginning balance (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
136 Beginning balance Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
137 Net income Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
138 Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
139 Total comprehensive income for the year, net of tax Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
140 Share options exercised for cash (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
141 Share options exercised for cash Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
142 Share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
143 Shares issued, net of transaction costs (in shares) Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
144 Shares issued, net of transaction costs Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
145 Shares repurchased under Normal Course Issuer Bid (in shares) Concept (Shares) For Period stn:IncreaseDecreaseInNumberOfSharesRepurchased
146 Shares repurchased under Normal Course Issuer Bid Concept (Monetary) For Period Debit ifrs-full:PurchaseOfTreasuryShares
147 Fair value reclass of share options exercised Concept (Monetary) For Period Credit stn:ReclassificationOfFairValueOfShareOptionsPreviouslyExpensedEquity
148 Dividends declared Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
149 Ending balance (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
150 Ending balance Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
151 0000007 - Statement - Consolidated Statements of Cash Flows Network

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 http://www.stantec.com/role/ConsolidatedStatementsofCashFlows
152 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
153 CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
154 Net income Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
155 Add (deduct) items not affecting cash: Abstract stn:AdjustmentsToReconcileProfitLossNonCashAbstract
156 Depreciation of property and equipment Concept (Monetary) For Period Debit stn:AdjustmentsForDepreciationExpensePropertyPlantAndEquipment
157 Depreciation of lease assets Concept (Monetary) For Period Debit stn:AdjustmentsForDepreciationExpenseOfRightOfUseAssets
158 Amortization of intangible assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForAmortisationExpense
159 Deferred income taxes Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
160 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
161 Provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
162 Other non-cash items Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsForNoncashItems
163 Cash flows from (used in) operations before changes in working capital Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
164 Trade and other receivables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
165 Unbilled receivables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInAccruedIncomeOtherThanContractAssets
166 Contract assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInContractAssets
167 Prepaid expenses Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInPrepaidExpenses
168 Income taxes net recoverable Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities
169 Trade and other payables and other accruals Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
170 Deferred revenue Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDeferredIncomeOtherThanContractLiabilities
171 Increase (decrease) in working capital Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
172 Net cash flows from operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
173 CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
174 Business acquisitions, net of cash acquired Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
175 Purchase of investments held for self-insured liabilities Concept (Monetary) For Period Credit stn:PurchaseOfInvestmentsHeldForSelfInsuredLiabilitiesClassifiedAsInvestingActivities
176 Proceeds from sale of investments held for self-insured liabilities Concept (Monetary) For Period Debit stn:ProceedsFromInvestmentsHeldForSelfInsuredLiabilitiesClassifiedAsInvestingActivities
177 Purchase of property and equipment and intangible assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfOtherLongtermAssetsClassifiedAsInvestingActivities
178 Other Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities
179 Net cash flows used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
180 CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
181 Net proceeds from issue of senior unsecured notes and bilateral term credit facility Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures
182 Net repayment of revolving credit facility Concept (Monetary) For Period Debit stn:ProceedsFromRepaymentsOfBorrowingsClassifiedAsFinancingActivities
183 Repayment of notes payable and software financing obligations Concept (Monetary) For Period Credit stn:PaymentsOfSoftwareFinancingObligationsAndNonCurrentBorrowings
184 Net (repayment of) proceeds from bank indebtedness Concept (Monetary) For Period Debit stn:NetRepaymentOfProceedsFromBankIndebtedness
185 Net lease payments Concept (Monetary) For Period Credit stn:CashFlowsUsedInFinancingActivitiesForLeases
186 Proceeds from issue of share capital, net of transaction costs Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
187 Repurchase of shares for cancellation Concept (Monetary) For Period Credit ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
188 Proceeds from exercise of share options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
189 Payment of dividends to shareholders Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
190 Net cash flows used in financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
191 Foreign exchange (loss) gain on cash held in foreign currency Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
192 Net increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
193 Cash and cash equivalents, beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition
194 Cash and cash equivalents, end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition
195 0000008 - Disclosure - Corporate Information Network

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 http://www.stantec.com/role/CorporateInformation
196 Corporate information and statement of IFRS compliance [abstract] Abstract ifrs-full:CorporateInformationAndStatementOfIFRSComplianceAbstract
197 Corporate Information Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
198 0000009 - Disclosure - Basis of Preparation Network

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 http://www.stantec.com/role/BasisofPreparation
199 Basis Of Preparation Of Financial Statements [Abstract] Abstract stn:BasisOfPreparationOfFinancialStatementsAbstract
200 Basis of Preparation Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
201 0000010 - Disclosure - Basis of Consolidation Network

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 http://www.stantec.com/role/BasisofConsolidation
202 Basis Of Consolidation [Abstract] Abstract stn:BasisOfConsolidationAbstract
203 Basis of Consolidation Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfBasisOfConsolidationExplanatory
204 0000011 - Disclosure - Material Accounting Policy Information Network

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 http://www.stantec.com/role/MaterialAccountingPolicyInformation
205 List Of Accounting Policies [Abstract] Abstract stn:ListOfAccountingPoliciesAbstract
206 Material Accounting Policy Information Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfMaterialAccountingPolicyInformationExplanatory
207 0000012 - Disclosure - Significant Accounting Judgments, Estimates, and Assumptions Network

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 http://www.stantec.com/role/SignificantAccountingJudgmentsEstimatesandAssumptions
208 Accounting Judgements And Estimates [Abstract] Abstract stn:AccountingJudgementsAndEstimatesAbstract
209 Significant Accounting Judgments, Estimates, and Assumptions Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
210 0000013 - Disclosure - Recent Accounting Pronouncements and Changes to Accounting Policies Network

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 http://www.stantec.com/role/RecentAccountingPronouncementsandChangestoAccountingPolicies
211 Accounting Policies, Changes In Accounting Estimates And Errors [Abstract] Abstract stn:AccountingPoliciesChangesInAccountingEstimatesAndErrorsAbstract
212 Recent Accounting Pronouncements and Changes to Accounting Policies Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory
213 0000014 - Disclosure - Business Acquisition Network

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 http://www.stantec.com/role/BusinessAcquisition
214 Business Acquisitions [Abstract] Abstract stn:BusinessAcquisitionsAbstract
215 Business Acquisition Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
216 0000015 - Disclosure - Cash and Cash Equivalents Network

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 http://www.stantec.com/role/CashandCashEquivalents
217 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
218 Cash and Cash Equivalents Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
219 0000016 - Disclosure - Trade and Other Receivables Network

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 http://www.stantec.com/role/TradeandOtherReceivables
220 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
221 Trade and Other Receivables Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
222 0000017 - Disclosure - Property and Equipment Network

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 http://www.stantec.com/role/PropertyandEquipment
223 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
224 Property and Equipment Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
225 0000018 - Disclosure - Lease Assets Network

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 http://www.stantec.com/role/LeaseAssets
226 Lease [Abstract] Abstract stn:LeaseAbstract
227 Lease Assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfLeasesExplanatory
228 0000019 - Disclosure - Goodwill Network

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 http://www.stantec.com/role/Goodwill
229 Goodwill [Abstract] Abstract stn:GoodwillAbstract
230 Goodwill Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfGoodwillExplanatory
231 0000020 - Disclosure - Intangible Assets Network

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 http://www.stantec.com/role/IntangibleAssets
232 Intangible assets other than goodwill [abstract] Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillAbstract
233 Intangible Assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
234 0000021 - Disclosure - Other Assets Network

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 http://www.stantec.com/role/OtherAssets
235 Other Asset [Abstract] Abstract stn:OtherAssetAbstract
236 Other Assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOtherAssetsExplanatory
237 0000022 - Disclosure - Trade and Other Payables Network

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 http://www.stantec.com/role/TradeandOtherPayables
238 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
239 Trade and Other Payables Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
240 0000023 - Disclosure - Long-Term Debt Network

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 http://www.stantec.com/role/LongTermDebt
241 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
242 Long-Term Debt Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
243 0000024 - Disclosure - Provisions Network

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 http://www.stantec.com/role/Provisions
244 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract stn:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
245 Provisions Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOtherProvisionsContingentLiabilitiesAndContingentAssetsExplanatory
246 0000025 - Disclosure - Employee Defined Benefit Plans Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlans
247 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
248 Employee Defined Benefit Plans Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
249 0000026 - Disclosure - Other Liabilities Network

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 http://www.stantec.com/role/OtherLiabilities
250 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
251 Other Liabilities Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOtherLiabilitiesExplanatory
252 0000027 - Disclosure - Commitments Network

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 http://www.stantec.com/role/Commitments
253 Lease [Abstract] Abstract stn:LeaseAbstract
254 Commitments Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfCommitmentsExplanatory
255 0000028 - Disclosure - Contingencies and Guarantees Network

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 http://www.stantec.com/role/ContingenciesandGuarantees
256 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract stn:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
257 Contingencies and Guarantees Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOtherProvisionsContingentLiabilitiesAndContingentAssetsExplanatory
258 0000029 - Disclosure - Share Capital Network

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 http://www.stantec.com/role/ShareCapital
259 Share-Based Payment Arrangements [Abstract] Abstract stn:ShareBasedPaymentArrangementsAbstract
260 Share Capital Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
261 0000030 - Disclosure - Fair Value Measurements Network

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 http://www.stantec.com/role/FairValueMeasurements
262 Fair Value Measurement [Abstract] Abstract stn:FairValueMeasurementAbstract
263 Fair Value Measurements Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFairValueMeasurementExplanatory
264 0000031 - Disclosure - Financial Instruments Network

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 http://www.stantec.com/role/FinancialInstruments
265 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
266 Financial Instruments Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
267 0000032 - Disclosure - Capital Management Network

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 http://www.stantec.com/role/CapitalManagement
268 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
269 Capital Management Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
270 0000033 - Disclosure - Income Taxes Network

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 http://www.stantec.com/role/IncomeTaxes
271 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
272 Income Taxes Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
273 0000034 - Disclosure - Net Interest Expense and Other Net Finance Expense Network

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 http://www.stantec.com/role/NetInterestExpenseandOtherNetFinanceExpense
274 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
275 Net Interest Expense and Other Net Finance Expense Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFinanceCostExplanatory
276 0000035 - Disclosure - Revenue Network

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277 Revenue From Contracts With Customers [Abstract] Abstract stn:RevenueFromContractsWithCustomersAbstract
278 Revenue Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfRevenueFromContractsWithCustomersExplanatory
279 0000036 - Disclosure - Employee Costs Network

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280 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
281 Employee Costs Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfEmployeeCostsTextBlock
282 0000037 - Disclosure - Other Income Network

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 http://www.stantec.com/role/OtherIncome
283 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
284 Other Income Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExpenseExplanatory
285 0000038 - Disclosure - Weighted Average Shares Outstanding Network

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 http://www.stantec.com/role/WeightedAverageSharesOutstanding
286 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
287 Weighted Average Shares Outstanding Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
288 0000039 - Disclosure - Cash Flow Information Network

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 http://www.stantec.com/role/CashFlowInformation
289 Cash Flow Statement [Abstract] Abstract stn:CashFlowStatementAbstract
290 Cash Flow Information Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
291 0000040 - Disclosure - Related-Party Disclosures Network

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 http://www.stantec.com/role/RelatedPartyDisclosures
292 Related Party [Abstract] Abstract stn:RelatedPartyAbstract
293 Related-Party Disclosures Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
294 0000041 - Disclosure - Segmented Information Network

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 http://www.stantec.com/role/SegmentedInformation
295 Operating Segments [Abstract] Abstract stn:OperatingSegmentsAbstract
296 Segmented Information Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
297 0000042 - Disclosure - Investment Tax Credits Network

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 http://www.stantec.com/role/InvestmentTaxCredits
298 Investment Tax Credits [Abstract] Abstract stn:InvestmentTaxCreditsAbstract
299 Investment Tax Credits Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfTaxReceivablesAndPayablesExplanatory
300 0000043 - Disclosure - Events after the Reporting Period Network

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 http://www.stantec.com/role/EventsaftertheReportingPeriod
301 Events After Reporting Period [Abstract] Abstract stn:EventsAfterReportingPeriodAbstract
302 Events after the Reporting Period Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
303 9954471 - Disclosure - Material Accounting Policy Information (Policies) Network

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 http://www.stantec.com/role/MaterialAccountingPolicyInformationPolicies
304 List Of Accounting Policies [Abstract] Abstract stn:ListOfAccountingPoliciesAbstract
305 Cash and cash equivalents Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
306 Property and equipment Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
307 Intangible assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
308 Leases Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
309 Investments in joint arrangements and associates Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory
310 Provisions Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
311 Foreign currency translation Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
312 Financial instruments Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
313 Impairment Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory
314 Revenue recognition Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
315 Employee defined benefit plans Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
316 Taxes Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
317 Share-based payment transactions Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
318 Business combinations and goodwill Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForBusinessCombinationsAndGoodwillExplanatory
319 Impairment of non-financial assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
320 Business combinations Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory
321 9954472 - Disclosure - Material Accounting Policy Information (Tables) Network

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 http://www.stantec.com/role/MaterialAccountingPolicyInformationTables
322 List Of Accounting Policies [Abstract] Abstract stn:ListOfAccountingPoliciesAbstract
323 Schedule of Estimated Useful Lives and Depreciation Calculation Methods Concept (dtr-types:textBlockItemType) For Period ifrs-full:DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory
324 9954473 - Disclosure - Business Acquisition (Tables) Network

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 http://www.stantec.com/role/BusinessAcquisitionTables
325 Business Acquisitions [Abstract] Abstract stn:BusinessAcquisitionsAbstract
326 Schedule of Aggregate Consideration for Assets Acquired and Liabilities Assumed and Consideration Paid Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
327 9954474 - Disclosure - Cash and Cash Equivalents (Tables) Network

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 http://www.stantec.com/role/CashandCashEquivalentsTables
328 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
329 Schedule of Cash and Cash Equivalents Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutCashAndCashEquivalentsTextBlock
330 9954475 - Disclosure - Trade and Other Receivables (Tables) Network

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 http://www.stantec.com/role/TradeandOtherReceivablesTables
331 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
332 Schedule of Trade and Other Receivables Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutTradeAndOtherReceivablesTextBlock
333 Schedule of Aging Analysis of Gross Trade Receivables Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutTheAgingAnalysisOfGrossTradeReceivablesTextBlock
334 9954476 - Disclosure - Property and Equipment (Tables) Network

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 http://www.stantec.com/role/PropertyandEquipmentTables
335 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
336 Schedule of Property and Equipment Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
337 9954477 - Disclosure - Lease Assets (Tables) Network

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 http://www.stantec.com/role/LeaseAssetsTables
338 Lease [Abstract] Abstract stn:LeaseAbstract
339 Schedule of Right-of-use Assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory
340 Schedule of Amounts Recognized in Administrative and Marketing Expenses Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutLeaseCostsTextBlock
341 9954478 - Disclosure - Goodwill (Tables) Network

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 http://www.stantec.com/role/GoodwillTables
342 Goodwill [Abstract] Abstract stn:GoodwillAbstract
343 Schedule of Reconciliation of Changes in Goodwill Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillExplanatory
344 Schedule of Goodwill Allocated Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesExplanatory
345 9954479 - Disclosure - Intangible Assets (Tables) Network

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 http://www.stantec.com/role/IntangibleAssetsTables
346 Intangible assets other than goodwill [abstract] Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillAbstract
347 Schedule of Intangible Assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
348 9954480 - Disclosure - Other Assets (Tables) Network

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 http://www.stantec.com/role/OtherAssetsTables
349 Other Asset [Abstract] Abstract stn:OtherAssetAbstract
350 Schedule of Other Assets Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutOtherAssetsTextBlock
351 Schedule of Fair Value and Amortized Cost Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFinancialAssetsExplanatory
352 Schedule of Disclosure of the Bond Portfolio Stated at Fair Value Concept (dtr-types:textBlockItemType) For Period ifrs-full:MaturityAnalysisForDerivativeFinancialLiabilities
353 9954481 - Disclosure - Trade and Other Payables (Tables) Network

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 http://www.stantec.com/role/TradeandOtherPayablesTables
354 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
355 Schedule of Trade and Other Payables Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutTradeAndOtherPayablesTextBlock
356 9954482 - Disclosure - Long-Term Debt (Tables) Network

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 http://www.stantec.com/role/LongTermDebtTables
357 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
358 Schedule of Long Term Debt Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
359 9954483 - Disclosure - Provisions (Tables) Network

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 http://www.stantec.com/role/ProvisionsTables
360 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract stn:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
361 Schedule of Provisions Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
362 9954484 - Disclosure - Employee Defined Benefit Plans (Tables) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansTables
363 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
364 Schedule of Employee Defined Benefit Plans Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDefinedBenefitObligationsExplanatoryTextBlock
365 Schedule of Reconciliation for Net Defined Benefit Liability Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
366 Schedule of Major Categories of Plan Assets, Measured at Fair Value Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
367 Schedule of Principal Assumptions Used In Determining Pension Benefit Plans Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfActuarialAssumptionsTextBlock
368 Schedule of Quantitative Sensitivity Analyses Impact on Defined Benefit Plans for Significant Assumptions Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
369 9954485 - Disclosure - Other Liabilities (Tables) Network

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 http://www.stantec.com/role/OtherLiabilitiesTables
370 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
371 Schedule of Other Liabilities Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutOtherLiabilitiesTextBlock
372 9954486 - Disclosure - Commitments (Tables) Network

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 http://www.stantec.com/role/CommitmentsTables
373 Lease [Abstract] Abstract stn:LeaseAbstract
374 Schedule of Lease Commitments Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfAdditionalInformationAboutLeasingActivitiesForLesseeExplanatory
375 9954487 - Disclosure - Share Capital (Tables) Network

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 http://www.stantec.com/role/ShareCapitalTables
376 Share-Based Payment Arrangements [Abstract] Abstract stn:ShareBasedPaymentArrangementsAbstract
377 Schedule of Dividends Declared and Recorded Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfDividendsExplanatory
378 Schedule of the Company's RSUs, PSUs, and DSUs Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
379 9954488 - Disclosure - Fair Value Measurements (Tables) Network

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 http://www.stantec.com/role/FairValueMeasurementsTables
380 Fair Value Measurement [Abstract] Abstract stn:FairValueMeasurementAbstract
381 Schedule of Fair Value Hierarchy for Assets Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFairValueMeasurementOfAssetsExplanatory
382 Schedule of Fair Value Hierarchy for Liabilities Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesExplanatory
383 9954489 - Disclosure - Financial Instruments (Tables) Network

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 http://www.stantec.com/role/FinancialInstrumentsTables
384 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
385 Schedule of Loss Allowance Provision Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfProvisionMatrixExplanatory
386 Schedule of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities Concept (dtr-types:textBlockItemType) For Period ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
387 9954490 - Disclosure - Capital Management (Tables) Network

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 http://www.stantec.com/role/CapitalManagementTables
388 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
389 Schedule of Capital Managed Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutCapitalManagedTextBlock
390 9954491 - Disclosure - Income Taxes (Tables) Network

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 http://www.stantec.com/role/IncomeTaxesTables
391 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
392 Schedule of Effective Income Tax for Continuing Operations from Statutory Canadian Tax Rates Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateTextBlock
393 Schedule of Major Components of Current and Deferred Income Tax Expense from Continuing Operations Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfMajorComponentsOfTaxExpenseIncomeTextBlock
394 Schedule of Significant Components of Net Deferred Income Tax Assets (Liabilities) and Reconciliation of Net Deferred Tax Assets (Liabilities) Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
395 Schedule of Loss Carryforwards and Deductible Temporary Differences Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfLossCarryforwardsAndDeductibleTemporaryDifferencesTextBlock
396 9954492 - Disclosure - Net Interest Expense and Other Net Finance Expense (Tables) Network

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 http://www.stantec.com/role/NetInterestExpenseandOtherNetFinanceExpenseTables
397 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
398 Schedule of Interest Expense Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfInterestIncomeExpenseExplanatory
399 9954493 - Disclosure - Employee Costs (Tables) Network

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 http://www.stantec.com/role/EmployeeCostsTables
400 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
401 Schedule of Components of Employee Costs Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutEmployeeCostsTextBlock
402 9954494 - Disclosure - Other Income (Tables) Network

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 http://www.stantec.com/role/OtherIncomeTables
403 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
404 Schedule of Other Income Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutOtherOperatingIncomeExpenseTextBlock
405 9954495 - Disclosure - Weighted Average Shares Outstanding (Tables) Network

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 http://www.stantec.com/role/WeightedAverageSharesOutstandingTables
406 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
407 Schedule of Number of Basic Shares Outstanding and Diluted Common Shares, Calculated on a Weighted Average Basis Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutWeightedAverageOrdinarySharesAndAdjustedWeightedAverageOrdinarySharesTextBlock
408 9954496 - Disclosure - Cash Flow Information (Tables) Network

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 http://www.stantec.com/role/CashFlowInformationTables
409 Cash Flow Statement [Abstract] Abstract stn:CashFlowStatementAbstract
410 Schedule of Reconciliation of Liabilities Arising from Financing Activities Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory
411 Schedule of Disclosure of Cash Flows from Operating Activities Under the Direct Method Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfCashFlowsFromOperatingActivitiesUnderTheDirectMethodTextBlock
412 Schedule of Amounts for Leases Recognized in the Consolidated Statements of Cash Flows Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfDetailedInformationAboutCashOutflowsForLeasesTextBlock
413 9954497 - Disclosure - Related-Party Disclosures (Tables) Network

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 http://www.stantec.com/role/RelatedPartyDisclosuresTables
414 Related Party [Abstract] Abstract stn:RelatedPartyAbstract
415 Schedule of Disclosure of Significant Entities Owning Voting and Restricted Stock Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfSignificantEntitiesOwningVotingAndRestrictedStockTextBlock
416 Schedule of Structured Entities Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesExplanatory
417 Schedule of Joint Operations Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfJointVenturesExplanatory
418 Schedule of Transactions with Joint Ventures Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
419 Schedule of Compensation of Key Management Personnel and Directors of the Company Concept (dtr-types:textBlockItemType) For Period stn:DisclosureOfKeyManagementPersonnelCompensationTextBlock
420 9954498 - Disclosure - Segmented Information (Tables) Network

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 http://www.stantec.com/role/SegmentedInformationTables
421 Operating Segments [Abstract] Abstract stn:OperatingSegmentsAbstract
422 Schedule of Operating Segments Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfOperatingSegmentsExplanatory
423 Schedule of Non-Current Assets and Gross Revenue by Geographical Areas Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfGeographicalAreasExplanatory
424 Schedule of Gross Revenue by Services Concept (dtr-types:textBlockItemType) For Period ifrs-full:DisclosureOfProductsAndServicesExplanatory
425 9954499 - Disclosure - Material Accounting Policy Information - Schedule of Estimated Useful Lives and Depreciation Calculation Methods (Details) Network

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 http://www.stantec.com/role/MaterialAccountingPolicyInformationScheduleofEstimatedUsefulLivesandDepreciationCalculationMethodsDetails
426 List Of Accounting Policies [Abstract] Abstract stn:ListOfAccountingPoliciesAbstract
427 Disclosure of detailed information about property, plant and equipment [table] Table ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
428 Range [axis] Axis ifrs-full:RangeAxis
429 Ranges Abstract ifrs-full:RangesMember
430 Bottom of range Abstract ifrs-full:BottomOfRangeMember
431 Top of range Abstract ifrs-full:TopOfRangeMember
432 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
433 Property, plant and equipment [member] Abstract ifrs-full:PropertyPlantAndEquipmentMember
434 Engineering equipment Abstract stn:EngineeringEquipmentMember
435 Office equipment Abstract ifrs-full:OfficeEquipmentMember
436 Leasehold improvements Abstract ifrs-full:LeaseholdImprovementsMember
437 Other Abstract ifrs-full:OtherPropertyPlantAndEquipmentMember
438 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
439 Estimated useful lives Concept (xbrli:durationItemType) For Period ifrs-full:UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment
440 9954500 - Disclosure - Material Accounting Policy Information - Additional Information (Details) Network

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 http://www.stantec.com/role/MaterialAccountingPolicyInformationAdditionalInformationDetails
441 List Of Accounting Policies [Abstract] Abstract stn:ListOfAccountingPoliciesAbstract
442 Disclosure of detailed information about intangible assets [table] Table ifrs-full:DisclosureOfIntangibleAssetsTable
443 Range [axis] Axis ifrs-full:RangeAxis
444 Ranges Abstract ifrs-full:RangesMember
445 Bottom of range Abstract ifrs-full:BottomOfRangeMember
446 Top of range Abstract ifrs-full:TopOfRangeMember
447 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
448 Intangible assets other than goodwill Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillMember
449 Client Relationships Abstract ifrs-full:CustomerrelatedIntangibleAssetsMember
450 Contract backlog and finite trademarks Abstract stn:ContractBacklogAndFiniteTrademarksMember
451 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
452 Share-based payment arrangements Abstract ifrs-full:SharebasedPaymentArrangementsMember
453 PSUs or RSUs Abstract stn:PerformanceShareUnitsPSUsOrRestrictedShareUnitsRSUsMember
454 DSUs Abstract stn:DeferredShareUnitsDSUsMember
455 Disclosure of detailed information about intangible assets [line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
456 Estimated lives Concept (xbrli:durationItemType) For Period ifrs-full:UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill
457 Number of deferred share units equal to common shares Concept (Shares) For Period stn:NumberOfOtherEquityInstrumentsGrantedInShareBasedPaymentArrangementPerCommonShare
458 Settlement period for share units Concept (xbrli:durationItemType) For Period stn:MaximumTermOfOptionsGrantedForShareBasedPaymentArrangement
459 9954501 - Disclosure - Business Acquisition - Additional Information (Details) Network

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 http://www.stantec.com/role/BusinessAcquisitionAdditionalInformationDetails
460 Business Acquisitions [Abstract] Abstract stn:BusinessAcquisitionsAbstract
461 Disclosure of detailed information about business combination [table] Table ifrs-full:DisclosureOfBusinessCombinationsTable
462 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
463 Entity's total for business combinations Abstract ifrs-full:EntitysTotalForBusinessCombinationsMember
464 Cardno and Other Acquisitions Abstract stn:CardnoAndOtherAcquisitionsMember
465 Barton Willmore LLP Abstract stn:BartonWillmoreLLPMember
466 L2P Abstract stn:L2IncAndPartridgeArchitectsIncMember
467 Aggregated individually immaterial business combinations Abstract ifrs-full:AggregatedIndividuallyImmaterialBusinessCombinationsMember
468 Environmental Systems Design, Inc. Abstract stn:EnvironmentalSystemsDesignInc.Member
469 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
470 Number of employees Concept (Decimal) As Of ifrs-full:NumberOfEmployees
471 Goodwill and intangible assets expected to be deductible for tax purposes Concept (Monetary) As Of Debit stn:GoodwillAndIntangibleAssetsExpectedToBeDeductibleForTaxPurposes
472 Provisions Concept (Monetary) As Of Credit ifrs-full:ContingentLiabilitiesRecognisedAsOfAcquisitionDate
473 Gross revenue earned Concept (Monetary) For Period Credit ifrs-full:RevenueOfAcquiree
474 9954502 - Disclosure - Business Acquisition - Schedule of Aggregate Consideration for Assets Acquired and Liabilities Assumed (Details) Network

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 http://www.stantec.com/role/BusinessAcquisitionScheduleofAggregateConsiderationforAssetsAcquiredandLiabilitiesAssumedDetails
475 Business Acquisitions [Abstract] Abstract stn:BusinessAcquisitionsAbstract
476 Disclosure of detailed information about business combination [table] Table ifrs-full:DisclosureOfBusinessCombinationsTable
477 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
478 Entity's total for business combinations Abstract ifrs-full:EntitysTotalForBusinessCombinationsMember
479 Other acquisitions Abstract ifrs-full:AggregatedIndividuallyImmaterialBusinessCombinationsMember
480 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
481 Cash consideration Concept (Monetary) As Of Credit ifrs-full:CashTransferred
482 Notes payable Concept (Monetary) As Of Credit ifrs-full:LiabilitiesIncurred
483 Consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
484 Cash acquired Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
485 Net cash paid Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
486 Assets and liabilities acquired Abstract ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
487 Non-cash working capital Concept (Monetary) As Of Debit stn:NonCashWorkingCapitalRecognisedAsOfAcquisitionDate
488 Lease assets Concept (Monetary) As Of Debit stn:RightOfUseAssetsRecognisedAsOfAcquisitionDate
489 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
490 Lease liabilities Concept (Monetary) As Of Credit stn:NoncurrentLeaseLiabilitiesRecognisedAsOfAcquisitionDate
491 Other Concept (Monetary) As Of Credit stn:OtherRecognisedAsOfAcquisitionDate
492 Total identifiable net assets at fair value Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
493 Goodwill arising on acquisitions Concept (Monetary) As Of Debit ifrs-full:GoodwillRecognisedAsOfAcquisitionDate
494 9954503 - Disclosure - Cash and Cash Equivalents (Details) Network

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 http://www.stantec.com/role/CashandCashEquivalentsDetails
495 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
496 Cash Concept (Monetary) As Of Debit ifrs-full:Cash
497 Unrestricted investments Concept (Monetary) As Of Debit ifrs-full:ShorttermInvestmentsClassifiedAsCashEquivalents
498 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition
499 9954504 - Disclosure - Trade and Other Receivables - Schedule of Trade and Other Receivables (Details) Network

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 http://www.stantec.com/role/TradeandOtherReceivablesScheduleofTradeandOtherReceivablesDetails
500 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
501 Trade receivables, net of expected credit losses of $2.7 (2022 – $2.0) Concept (Monetary) As Of Debit ifrs-full:TradeReceivables
502 Holdbacks and other Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
503 Trade and other receivables Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherReceivables
504 Expected credit losses Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
505 9954505 - Disclosure - Trade and Other Receivables - Schedule of Aging Analysis of Gross Trade Receivables (Details) Network

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 http://www.stantec.com/role/TradeandOtherReceivablesScheduleofAgingAnalysisofGrossTradeReceivablesDetails
506 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
507 Trade and Other Receivables [table] Table stn:TradeAndOtherReceivablesTable
508 Maturity [axis] Axis ifrs-full:MaturityAxis
509 Aggregated time bands Abstract ifrs-full:AggregatedTimeBandsMember
510 1-30 Abstract stn:OneToThirtyDaysMember
511 31-60 Abstract stn:ThirtyOneToSixtyDaysMember
512 61-90 Abstract stn:SixtyOneToNinetyDaysMember
513 91-120 Abstract stn:NinetyOneDaysToOneTwentyDaysMember
514 121+ Abstract stn:AboveOneTwentyOneDaysMember
515 Trade and other receivables [line items] LineItems stn:TradeAndOtherReceivablesLineItems
516 Gross trade receivables Concept (Monetary) As Of Debit stn:GrossTradeReceivables
517 9954506 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Details) Network

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 http://www.stantec.com/role/PropertyandEquipmentScheduleofPropertyandEquipmentDetails
518 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
519 Disclosure of detailed information about property, plant and equipment [table] Table ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
520 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
521 Carrying amount Abstract ifrs-full:CarryingAmountMember
522 Cost Abstract ifrs-full:GrossCarryingAmountMember
523 Accumulated depreciation Abstract ifrs-full:AccumulatedDepreciationAndAmortisationMember
524 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
525 Property, plant and equipment [member] Abstract ifrs-full:PropertyPlantAndEquipmentMember
526 Engineering equipment Abstract stn:EngineeringEquipmentMember
527 Office equipment Abstract ifrs-full:OfficeEquipmentMember
528 Leasehold improvements Abstract ifrs-full:LeaseholdImprovementsMember
529 Other Abstract ifrs-full:OtherPropertyPlantAndEquipmentMember
530 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
531 Reconciliation of changes in property, plant and equipment [abstract] Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
532 Beginning balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
533 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
534 Measurement period adjustment net of acquisition additions Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment
535 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
536 Impact of foreign exchange Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
537 Additions arising on acquisitions Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
538 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
539 Net impairment (note 11) Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
540 Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
541 9954507 - Disclosure - Lease Assets - Schedule of Right-of-use Assets (Details) Network

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 http://www.stantec.com/role/LeaseAssetsScheduleofRightofuseAssetsDetails
542 Lease [Abstract] Abstract stn:LeaseAbstract
543 Disclosure of quantitative information about right-of-use assets [table] Table ifrs-full:DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable
544 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
545 Property, plant and equipment [member] Abstract ifrs-full:PropertyPlantAndEquipmentMember
546 Building Abstract ifrs-full:BuildingsMember
547 Other Abstract ifrs-full:OtherPropertyPlantAndEquipmentMember
548 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
549 Assets Abstract ifrs-full:ClassesOfAssetsMember
550 Lease assets Abstract ifrs-full:RightofuseAssetsMember
551 Disclosure of quantitative information about right-of-use assets [line items] LineItems ifrs-full:DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems
552 Beginning balance Concept (Monetary) As Of Debit ifrs-full:RightofuseAssets
553 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsToRightofuseAssets
554 Acquisitions Concept (Monetary) For Period Debit stn:AcquisitionsThroughBusinessCombinationsRightOfUseAssets
555 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationRightofuseAssets
556 Modifications Concept (Monetary) For Period Debit stn:IncreaseDecreaseThroughModificationOfRightOfUseAssets
557 Reversal of impairment, net Concept (Monetary) For Period Debit stn:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossRightOfUseAssets
558 Foreign exchange Concept (Monetary) For Period Debit stn:IncreaseDecreaseThroughNetExchangeDifferencesRightOfUseAssets
559 Ending balance Concept (Monetary) As Of Debit ifrs-full:RightofuseAssets
560 9954508 - Disclosure - Lease Assets - Additional Information (Details) Network

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 http://www.stantec.com/role/LeaseAssetsAdditionalInformationDetails
561 Lease [Abstract] Abstract stn:LeaseAbstract
562 Disclosure of detailed information about quantitative information about leases for lessee [Table] Table stn:DisclosureOfDetailedInformationAboutQuantitativeInformationAboutLeasesForLesseeTable
563 Range [axis] Axis ifrs-full:RangeAxis
564 Ranges Abstract ifrs-full:RangesMember
565 Bottom of range Abstract ifrs-full:BottomOfRangeMember
566 Top of range Abstract ifrs-full:TopOfRangeMember
567 Weighted average Abstract ifrs-full:WeightedAverageMember
568 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
569 Property, plant and equipment [member] Abstract ifrs-full:PropertyPlantAndEquipmentMember
570 Office space Abstract stn:OfficeSpaceMember
571 Office equipment Abstract ifrs-full:OfficeEquipmentMember
572 IT and other equipment Abstract stn:ITAndOtherEquipmentMember
573 Disclosure of detailed information about quantitative information about leases for lessee [Line Items] LineItems stn:DisclosureOfDetailedInformationAboutQuantitativeInformationAboutLeasesForLesseeLineItems
574 Lease term Concept (xbrli:durationItemType) For Period stn:LeaseTerm
575 Onerous contracts provision Concept (Monetary) As Of Credit ifrs-full:OnerousContractsProvision
576 9954509 - Disclosure - Lease Assets - Schedule of Amounts Recognized in Administrative and Marketing Expenses (Details) Network

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 http://www.stantec.com/role/LeaseAssetsScheduleofAmountsRecognizedinAdministrativeandMarketingExpensesDetails
577 Lease [Abstract] Abstract stn:LeaseAbstract
578 Rent expense - variable lease payments Concept (Monetary) For Period Debit ifrs-full:ExpenseRelatingToVariableLeasePaymentsNotIncludedInMeasurementOfLeaseLiabilities
579 Rent expense - short-term leases and leases of low-value assets Concept (Monetary) For Period Debit stn:ExpenseRelatingToShortTermLeasesAndLeasesOfLowValueAssetsForWhichRecognitionExemptionHasBeenUsed
580 Income from subleases Concept (Monetary) For Period Credit ifrs-full:IncomeFromSubleasingRightofuseAssets
581 Total Concept (Monetary) For Period Debit stn:TotalExpenseRelatingToLeasePaymentsNotIncludedInMeasurementOfLeaseLiabilities
582 9954510 - Disclosure - Goodwill - Schedule of Reconciliation of Changes in Goodwill (Details) Network

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 http://www.stantec.com/role/GoodwillScheduleofReconciliationofChangesinGoodwillDetails
583 Goodwill [Abstract] Abstract stn:GoodwillAbstract
584 Disclosure of reconciliation of changes in goodwill [table] Table ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillTable
585 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
586 Carrying amount Abstract ifrs-full:CarryingAmountMember
587 Gross Abstract ifrs-full:GrossCarryingAmountMember
588 Accumulated impairment Abstract ifrs-full:AccumulatedImpairmentMember
589 Disclosure of reconciliation of changes in goodwill [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillLineItems
590 Reconciliation of changes in goodwill [abstract] Abstract ifrs-full:ReconciliationOfChangesInGoodwillAbstract
591 Goodwill, beginning of the year Concept (Monetary) As Of Debit ifrs-full:Goodwill
592 Acquisitions Concept (Monetary) For Period Debit ifrs-full:AdditionalRecognitionGoodwill
593 Impact of foreign exchange Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesGoodwill
594 Goodwill, end of the year Concept (Monetary) As Of Debit ifrs-full:Goodwill
595 9954511 - Disclosure - Goodwill - Schedule of Goodwill Allocated (Details) Network

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 http://www.stantec.com/role/GoodwillScheduleofGoodwillAllocatedDetails
596 Goodwill [Abstract] Abstract stn:GoodwillAbstract
597 Disclosure of information for cash-generating units [table] Table ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable
598 Cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis
599 Entity's total for cash-generating units Abstract ifrs-full:EntitysTotalForCashgeneratingUnitsMember
600 Cash-generating units Abstract ifrs-full:IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesMember
601 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
602 Geographical areas Abstract ifrs-full:GeographicalAreasMember
603 Canada Abstract country:CA
604 United States Abstract country:US
605 Foreign countries [member] Abstract ifrs-full:ForeignCountriesMember
606 Disclosure of information for cash-generating units [line items] LineItems ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
607 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
608 9954512 - Disclosure - Goodwill - Additional Information (Details) Network

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 http://www.stantec.com/role/GoodwillAdditionalInformationDetails
609 Goodwill [Abstract] Abstract stn:GoodwillAbstract
610 Disclosure of information for cash-generating units [table] Table ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable
611 Range [axis] Axis ifrs-full:RangeAxis
612 Ranges Abstract ifrs-full:RangesMember
613 Bottom of range Abstract ifrs-full:BottomOfRangeMember
614 Top of range Abstract ifrs-full:TopOfRangeMember
615 Geographical [Axis] Axis srt:StatementGeographicalAxis
616 Geographical [Domain] Abstract srt:SegmentGeographicalDomain
617 Global Abstract stn:GlobalMember
618 Canada Abstract country:CA
619 United States Abstract country:US
620 Disclosure of information for cash-generating units [line items] LineItems ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
621 Discount rate applied to cash flow projections Concept (dtr-types:percentItemType) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
622 Percentage of growth rate Concept (dtr-types:percentItemType) As Of ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
623 Amount of recoverable amount exceeds carrying amount Concept (Monetary) As Of Debit ifrs-full:AmountByWhichUnitsRecoverableAmountExceedsItsCarryingAmount
624 Terminal operating margins Concept (dtr-types:percentItemType) As Of stn:ValueAssignedToKeyAssumption
625 Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount Concept (Decimal) As Of ifrs-full:AmountByWhichValueAssignedToKeyAssumptionMustChangeInOrderForUnitsRecoverableAmountToBeEqualToCarryingAmount
626 9954513 - Disclosure - Intangible Assets - Schedule of Intangible Assets (Details) Network

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 http://www.stantec.com/role/IntangibleAssetsScheduleofIntangibleAssetsDetails
627 Intangible assets other than goodwill [abstract] Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillAbstract
628 Disclosure of detailed information about intangible assets [table] Table ifrs-full:DisclosureOfIntangibleAssetsTable
629 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
630 Intangible assets other than goodwill Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillMember
631 Client Relationships Abstract ifrs-full:CustomerrelatedIntangibleAssetsMember
632 Contract Backlog Abstract stn:ContractBacklogMember
633 Software and other Abstract ifrs-full:ComputerSoftwareMember
634 Other Abstract ifrs-full:OtherIntangibleAssetsMember
635 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
636 Carrying amount Abstract ifrs-full:CarryingAmountMember
637 Cost Abstract ifrs-full:GrossCarryingAmountMember
638 Accumulated depreciation Abstract ifrs-full:AccumulatedDepreciationAndAmortisationMember
639 Disclosure of detailed information about intangible assets [line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
640 Reconciliation of changes in intangible assets other than goodwill [abstract] Abstract ifrs-full:ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract
641 Beginning balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
642 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
643 Additions arising on acquisitions Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
644 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
645 Removal of fully amortized assets Concept (Monetary) For Period Credit ifrs-full:RetirementsIntangibleAssetsOtherThanGoodwill
646 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill
647 Impact of foreign exchange Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill
648 Ending balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
649 9954514 - Disclosure - Intangible Assets - Additional Information (Details) Network

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 http://www.stantec.com/role/IntangibleAssetsAdditionalInformationDetails
650 Intangible assets other than goodwill [abstract] Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillAbstract
651 Disclosure of detailed information about intangible assets [table] Table ifrs-full:DisclosureOfIntangibleAssetsTable
652 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
653 Intangible assets other than goodwill Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillMember
654 Software licenses Abstract stn:SoftwareLicensesMember
655 Disclosure of detailed information about intangible assets [line Items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
656 Software financing obligations Concept (Monetary) As Of Credit stn:SoftwareFinancingObligation
657 9954515 - Disclosure - Other Assets - Schedule of Other Assets (Details) Network

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 http://www.stantec.com/role/OtherAssetsScheduleofOtherAssetsDetails
658 Other Asset [Abstract] Abstract stn:OtherAssetAbstract
659 Disclosure of Other Assets [table] Table stn:DisclosureOfOtherAssetsTable
660 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
661 Financial assets, class Abstract ifrs-full:FinancialAssetsMember
662 Investments held for self-insured liabilities Abstract stn:InvestmentsHeldForSelfInsuredLiabilitiesMember
663 Holdbacks on long-term contracts Abstract stn:HoldbacksOnLongTermContractMember
664 Other Abstract stn:OtherMember
665 Disclosure of other assets [line items] LineItems stn:DisclosureOfOtherAssetsLineItems
666 Financial assets Concept (Monetary) As Of Debit ifrs-full:OtherFinancialAssets
667 Other Concept (Monetary) As Of Debit ifrs-full:OtherNonfinancialAssets
668 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherAssets
669 Less current portion - financial Concept (Monetary) As Of Debit ifrs-full:OtherCurrentFinancialAssets
670 Less current portion - non-financial Concept (Monetary) As Of Debit ifrs-full:OtherCurrentNonfinancialAssets
671 Long-term portion Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
672 9954515 - Disclosure - Other Assets - Schedule of Other Assets (Details) Network

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 http://www.stantec.com/role/OtherAssetsScheduleofOtherAssetsDetails_1
673 9954516 - Disclosure - Other Assets - Schedule of Fair Value and Amortized Cost (Details) Network

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 http://www.stantec.com/role/OtherAssetsScheduleofFairValueandAmortizedCostDetails
674 Other Asset [Abstract] Abstract stn:OtherAssetAbstract
675 Disclosure Of Investments Held For Self Insured Liabilities At Fair Value And Amortized Cost [table] Table stn:DisclosureOfInvestmentsHeldForSelfInsuredLiabilitiesAtFairValueAndAmortizedCostTable
676 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
677 Financial assets, class Abstract ifrs-full:FinancialAssetsMember
678 Bonds Abstract stn:BondMember
679 Equity securities Abstract ifrs-full:EquityInvestmentsMember
680 Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items] LineItems stn:DisclosureOfInvestmentsHeldForSelfInsuredLiabilitiesAtFairValueAndAmortizedCostLineItems
681 Fair Value Concept (Monetary) As Of Debit ifrs-full:OtherFinancialAssets
682 Amortized Cost/Cost Concept (Monetary) As Of Debit stn:OtherFinancialAssetAtAmortisedCost
683 9954517 - Disclosure - Other Assets - Additional Information (Details) Network

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 http://www.stantec.com/role/OtherAssetsAdditionalInformationDetails
684 Other Asset [Abstract] Abstract stn:OtherAssetAbstract
685 Disclosure Of Investments Held For Self Insured Liabilities Maturity Of Bond Portfolio At Fair Value [table] Table stn:DisclosureOfInvestmentsHeldForSelfInsuredLiabilitiesMaturityOfBondPortfolioAtFairValueTable
686 Range [axis] Axis ifrs-full:RangeAxis
687 Ranges Abstract ifrs-full:RangesMember
688 Bottom of range Abstract ifrs-full:BottomOfRangeMember
689 Top of range Abstract ifrs-full:TopOfRangeMember
690 Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items] LineItems stn:DisclosureOfInvestmentsHeldForSelfInsuredLiabilitiesMaturityOfBondPortfolioAtFairValueLineItems
691 Bonds interest rate Concept (dtr-types:percentItemType) For Period stn:BondsInterestRatePercentage
692 9954518 - Disclosure - Other Assets - Schedule of Disclosure of the Bond Portfolio Stated at Fair Value (Details) Network

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 http://www.stantec.com/role/OtherAssetsScheduleofDisclosureoftheBondPortfolioStatedatFairValueDetails
693 Other Asset [Abstract] Abstract stn:OtherAssetAbstract
694 Disclosure of maturity analysis for financial assets held for managing liquidity risk [table] Table ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable
695 Maturity [axis] Axis ifrs-full:MaturityAxis
696 Aggregated time bands Abstract ifrs-full:AggregatedTimeBandsMember
697 Within one year Abstract ifrs-full:NotLaterThanOneYearMember
698 After one year but not more than five years Abstract ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
699 More than five years Abstract ifrs-full:LaterThanFiveYearsMember
700 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
701 Financial assets, class Abstract ifrs-full:FinancialAssetsMember
702 Bonds Abstract stn:BondMember
703 Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems
704 Maturity of bond portfolio, stated at fair value Concept (Monetary) As Of Debit stn:FairValueOfOtherFinancialAssetsMaturity
705 9954519 - Disclosure - Trade and Other Payables (Details) Network

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 http://www.stantec.com/role/TradeandOtherPayablesDetails
706 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
707 Trade accounts payable and accruals Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesToTradeSuppliers
708 Employee and payroll liabilities Concept (Monetary) As Of Credit stn:EmployeeAndPayrollLiabilities
709 Other accrued liabilities Concept (Monetary) As Of Credit ifrs-full:Accruals
710 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayables
711 9954520 - Disclosure - Long-Term Debt - Schedule of Long Term Debt (Details) Network

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 http://www.stantec.com/role/LongTermDebtScheduleofLongTermDebtDetails
712 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
713 Disclosure of detailed information about borrowings [table] Table ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
714 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
715 Borrowings by name Abstract ifrs-full:BorrowingsByNameMember
716 Senior unsecured notes Abstract stn:SeniorUnsecuredNotesMember
717 Revolving credit facility Abstract stn:SeniorRevolvingCreditFacilityMember
718 Term loan facilities Abstract stn:SeniorTermLoansMember
719 Notes payable Abstract stn:NotesPayableMember
720 Software financing obligations Abstract stn:SoftwareFinancingObligationsMember
721 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
722 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
723 Less current portion Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
724 Long-term portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
725 9954521 - Disclosure - Long-Term Debt - Additional Information (Details) Network

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 http://www.stantec.com/role/LongTermDebtAdditionalInformationDetails
726 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
727 Disclosure of detailed information about borrowings [table] Table ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
728 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
729 Borrowings by name Abstract ifrs-full:BorrowingsByNameMember
730 Senior unsecured notes Abstract stn:SeniorUnsecuredNotesMember
731 Revolving credit facility Abstract stn:SeniorRevolvingCreditFacilityMember
732 Term loan facilities Abstract stn:SeniorTermLoansMember
733 Unsecured bilateral Abstract stn:UnsecuredBilateralMember
734 Unsecured multicurrency facility Abstract stn:UnsecuredMulticurrencyFacilityMember
735 Overdraft facility Abstract stn:OverdraftFacilityMember
736 Syndicated senior credit facilities Abstract stn:SyndicatedSeniorCreditFacilitiesMember
737 Notes payable Abstract stn:NotesPayableMember
738 Software financing obligations Abstract stn:SoftwareFinancingObligationsMember
739 Letter of credit Abstract stn:LettersOfCreditMember
740 Surety facilities Abstract stn:SuretyFacilitiesMember
741 Surety facilities expiring before September 2026 Abstract stn:SuretyFacilitiesExpiringBeforeSeptember2026Member
742 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
743 Past due status Abstract ifrs-full:PastDueStatusMember
744 Expire before 2022 Abstract stn:ExpireBeforeTwoThousandTwentyTwoMember
745 Open-ended terms Abstract stn:OpenEndedTermsMember
746 Range [axis] Axis ifrs-full:RangeAxis
747 Ranges Abstract ifrs-full:RangesMember
748 Weighted average Abstract ifrs-full:WeightedAverageMember
749 Currency [Axis] Axis srt:CurrencyAxis
750 All Currencies [Domain] Abstract currency:AllCurrenciesDomain
751 Canadian Dollars Abstract stn:CanadianDollarsMember
752 US dollars Abstract stn:USDollarsMember
753 Other Foreign Currencies Abstract stn:OtherForeignCurrenciesMember
754 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
755 Notional amount Concept (Monetary) As Of ifrs-full:NotionalAmount
756 Borrowings, interest rate Concept (dtr-types:percentItemType) As Of ifrs-full:BorrowingsInterestRate
757 Revolving credit facilities amount Concept (Monetary) As Of Credit stn:LineOfCreditFacilityMaximumBorrowingsCapacity
758 Number of tranches Concept (Integer) For Period stn:NumberOfTranches
759 Additional revolving credit facilities amount Concept (Monetary) As Of Credit stn:LineOfCreditFacilityAdditionalBorrowingsCapacity
760 Payable amount Concept (Monetary) As Of Credit stn:BorrowingsPayableAmount
761 Letter of credit outstanding Concept (Monetary) As Of Credit stn:LettersOfCreditOutstandingIssuedAmount
762 Amount available under the facility Concept (Monetary) As Of Credit ifrs-full:UndrawnBorrowingFacilities
763 Bank indebtedness Concept (Monetary) As Of Credit ifrs-full:BankOverdraftsClassifiedAsCashEquivalents
764 Aggregate maturity value of notes Concept (Monetary) As Of Credit stn:AggregateMaturityValueOfNotes
765 Software additions acquired through software financing obligations Concept (Monetary) For Period Credit stn:IncreaseDecreaseInBorrowings
766 Letter of credit issued and outstanding in addition Concept (Monetary) For Period Credit stn:LettersOfCreditIssuedAndOutstandingInAddition
767 Bonds issued under surety facilities Concept (Monetary) As Of Credit ifrs-full:BondsIssued
768 9954522 - Disclosure - Long-Term Debt - Schedule of Notes Payable (Details) Network

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 http://www.stantec.com/role/LongTermDebtScheduleofNotesPayableDetails
769 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
770 Disclosure of detailed information about borrowings [table] Table ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
771 Currency [Axis] Axis srt:CurrencyAxis
772 All Currencies [Domain] Abstract currency:AllCurrenciesDomain
773 US dollars Abstract stn:USDollarsMember
774 British pounds Abstract stn:BritishPoundMember
775 Other currencies Abstract stn:OtherForeignCurrencyMember
776 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
777 Borrowings by name Abstract ifrs-full:BorrowingsByNameMember
778 Notes payable Abstract stn:NotesPayableMember
779 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
780 Liabilities [member] Abstract ifrs-full:LiabilitiesMember
781 Contingent consideration Abstract ifrs-full:ContingentConsiderationMember
782 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
783 Carrying amount of notes payable Concept (Monetary) As Of Credit stn:CarryingAmountOfNotesPayable
784 9954523 - Disclosure - Provisions - Schedule of Provisions (Details) Network

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 http://www.stantec.com/role/ProvisionsScheduleofProvisionsDetails
785 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract stn:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
786 Disclosure of other provisions [table] Table ifrs-full:DisclosureOfOtherProvisionsTable
787 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
788 Other provisions Abstract ifrs-full:OtherProvisionsMember
789 Self-insured liabilities Abstract stn:SelfInsuredLiabilitiesProvisionMember
790 Claims Abstract stn:ProvisionForClaimsMember
791 Lease restoration Abstract ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
792 Onerous contracts Abstract ifrs-full:OnerousContractsProvisionMember
793 Disclosure of other provisions [Line Items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
794 Reconciliation of changes in other provisions [abstract] Abstract ifrs-full:ReconciliationOfChangesInOtherProvisionsAbstract
795 Balance, beginning of the year Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
796 Current year provisions Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInExistingProvisionsOtherProvisions
797 Paid or otherwise settled Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
798 Impact of foreign exchange Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
799 Balance, end of the year Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
800 Less current portion Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
801 Long-term portion Concept (Monetary) As Of Credit ifrs-full:OtherLongtermProvisions
802 9954524 - Disclosure - Provisions - Additional Information (Details) Network

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 http://www.stantec.com/role/ProvisionsAdditionalInformationDetails
803 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract stn:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
804 Disclosure of other provisions [table] Table ifrs-full:DisclosureOfOtherProvisionsTable
805 Range [axis] Axis ifrs-full:RangeAxis
806 Ranges Abstract ifrs-full:RangesMember
807 Bottom of range Abstract ifrs-full:BottomOfRangeMember
808 Top of range Abstract ifrs-full:TopOfRangeMember
809 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
810 Other provisions Abstract ifrs-full:OtherProvisionsMember
811 Claims Abstract stn:ProvisionForClaimsMember
812 Lease restoration Abstract ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
813 Disclosure of other provisions [Line Items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
814 Cash outflows for existing provisions expected period Concept (Text/String) For Period ifrs-full:DescriptionOfExpectedTimingOfOutflowsOtherProvisions
815 9954525 - Disclosure - Employee Defined Benefit Plans - Schedule of Employee Defined Benefit Plans (Details) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansScheduleofEmployeeDefinedBenefitPlansDetails
816 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
817 Disclosure of defined benefit plans [table] Table ifrs-full:DisclosureOfDefinedBenefitPlansTable
818 Characteristics of defined benefit plans [axis] Axis ifrs-full:CharacteristicsOfDefinedBenefitPlansAxis
819 Characteristics of defined benefit plans Abstract ifrs-full:CharacteristicsOfDefinedBenefitPlansMember
820 Pension defined benefit plans Abstract ifrs-full:PensionDefinedBenefitPlansMember
821 Post employment benefit plans Abstract stn:PostEmploymentBenefitPlansMember
822 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
823 Net employee defined benefit asset Concept (Monetary) As Of Debit ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan
824 Net defined benefit liability Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
825 Net defined benefit (asset) liability Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
826 9954526 - Disclosure - Employee Defined Benefit Plans - Additional Information (Details) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansAdditionalInformationDetails
827 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
828 Amount expected to be contribute in next annual reporting period Concept (Monetary) For Period Credit ifrs-full:EstimateOfContributionsExpectedToBePaidToPlan
829 Percent of defined benefit obligation was fully covered against changes in interest rates Concept (dtr-types:percentItemType) As Of stn:PercentageOfDefinedBenefitObligationFullyCoveredWithAnnuityPolicies
830 Deferred tax (recovery) expense on remeasurement of net employee defined benefit liability Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
831 Remeasurement gain on net employee defined benefit plans Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
832 Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash Concept (dtr-types:percentItemType) For Period stn:PercentageOfPlanAssetInSecuritiesOrHeldInMutualExchangeTradedAndPooledFundsAndInCash
833 Percentage of plans' assets held in annuity policies Concept (dtr-types:percentItemType) For Period stn:PercentageOfPlanAssetInAnnuityPolicies
834 Weighted average duration of defined benefit obligation Concept (xbrli:durationItemType) For Period ifrs-full:WeightedAverageDurationOfDefinedBenefitObligation2019
835 9954527 - Disclosure - Employee Defined Benefit Plans - Schedule of Reconciliation for Net Defined Benefit (Asset) Liability (Details) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansScheduleofReconciliationforNetDefinedBenefitAssetLiabilityDetails
836 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
837 Disclosure of net defined benefit liability (asset) [table] Table ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable
838 Net defined benefit liability (asset) [axis] Axis ifrs-full:NetDefinedBenefitLiabilityAssetAxis
839 Net defined benefit liability (asset) Abstract ifrs-full:NetDefinedBenefitLiabilityAssetMember
840 Defined benefit obligation Abstract ifrs-full:PresentValueOfDefinedBenefitObligationMember
841 Fair value of plan assets Abstract ifrs-full:PlanAssetsMember
842 Characteristics of defined benefit plans [axis] Axis ifrs-full:CharacteristicsOfDefinedBenefitPlansAxis
843 Characteristics of defined benefit plans Abstract ifrs-full:CharacteristicsOfDefinedBenefitPlansMember
844 Pension defined benefit plans Abstract ifrs-full:PensionDefinedBenefitPlansMember
845 Disclosure of net defined benefit liability (asset) [Line Items] LineItems ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
846 Balance, beginning of the year Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
847 Administrative and marketing expenses Abstract ifrs-full:ChangesInNetDefinedBenefitLiabilityAssetAbstract
848 Interest income (expense) Concept (Monetary) For Period Credit ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
849 Administrative expenses paid by the Plans Concept (Monetary) For Period Credit stn:AdministrativeExpenseNetDefinedBenefitLiabilityAsset
850 Net defined benefit liability asset included in profit or loss Concept (Monetary) For Period Credit stn:NetDefinedBenefitLiabilityAssetIncludedInProfitOrLoss
851 Other comprehensive income (loss) Abstract ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract
852 Adjustments on the plan assets, excluding interest income Concept (Monetary) For Period Debit ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
853 Actuarial gains (losses) arising from: Abstract stn:ActuarialGainsLossesArisingFromNetDefinedBenefitLiabilityAssetAbstract
854 Changes in demographic assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
855 Changes in financial assumptions Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
856 Experience adjustments Concept (Monetary) For Period Debit ifrs-full:ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset
857 Remeasurement gain (loss), before tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
858 Effect of movement in exchange rates Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
859 Net defined benefit liability asset included in other comprehensive income Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
860 Other Abstract stn:OtherNetDefinedBenefitLiabilityAssetAbstract
861 Benefits paid Concept (Monetary) For Period Debit ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
862 Contributions by employer Concept (Monetary) For Period Debit ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
863 Other net defined benefit liability asset Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
864 Balance, end of the year Concept (Monetary) As Of Credit ifrs-full:LiabilityAssetOfDefinedBenefitPlans
865 9954528 - Disclosure - Employee Defined Benefit Plans - Schedule of Major Categories of Plan Assets, Measured at Fair Value (Details) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansScheduleofMajorCategoriesofPlanAssetsMeasuredatFairValueDetails
866 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
867 Disclosure of fair value of plan assets [table] Table ifrs-full:DisclosureOfFairValueOfPlanAssetsTable
868 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
869 All levels of fair value hierarchy Abstract ifrs-full:AllLevelsOfFairValueHierarchyMember
870 Level 1 Abstract ifrs-full:Level1OfFairValueHierarchyMember
871 Level 2 and 3 of fair value hierarchy Abstract ifrs-full:Level2And3OfFairValueHierarchyMember
872 Disclosure of fair value of plan assets [Line Items] LineItems ifrs-full:DisclosureOfFairValueOfPlanAssetsLineItems
873 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets
874   Equities Concept (Monetary) As Of Debit ifrs-full:EquityInstrumentsAmountContributedToFairValueOfPlanAssets
875   Fixed income, corporate bonds, and gilts Concept (Monetary) As Of Debit ifrs-full:DebtInstrumentsAmountContributedToFairValueOfPlanAssets
876   Pooled fund liability-driven investments Concept (Monetary) As Of Debit stn:PooledFundLiabilityDrivenInvestmentsAmountContributedToFairValueOfPlanAssets
877   Alternatives and property funds Concept (Monetary) As Of Debit ifrs-full:InvestmentFundsAmountContributedToFairValueOfPlanAssets
878   Annuity policies Concept (Monetary) As Of Debit stn:AnnuityPoliciesAmountContributedToFairValueOfPlanAssets
879 Equities and property Concept (Monetary) As Of Debit stn:EquityInstrumentsAndPropertyAmountContributedToFairValueOfPlanAssets
880 Fair value of plan assets Concept (Monetary) As Of Debit ifrs-full:PlanAssetsAtFairValue
881 9954529 - Disclosure - Employee Defined Benefit Plans - Schedule of Principal Assumptions Used In Determining Pension Benefit Obligations (Details) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansScheduleofPrincipalAssumptionsUsedInDeterminingPensionBenefitObligationsDetails
882 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
883 Discount rate Concept (dtr-types:percentItemType) As Of ifrs-full:ActuarialAssumptionOfDiscountRates
884 Rate of increase in salaries Concept (dtr-types:percentItemType) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
885 Rate of inflation, pre-retirement Concept (dtr-types:percentItemType) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfInflation
886 Rate of increase in future pensions payment Concept (dtr-types:percentItemType) As Of ifrs-full:ActuarialAssumptionOfExpectedRatesOfPensionIncreases
887 Life expectancy at age 65 for current pensioners: Abstract stn:LifeExpectancyAtAgeSixtyFiveForCurrentPensionersAbstract
888   Male Concept (xbrli:durationItemType) For Period stn:ActuarialAssumptionOfLifeExpectancyAfterRetirementMale
889   Female Concept (xbrli:durationItemType) For Period stn:ActuarialAssumptionOfLifeExpectancyAfterRetirementFemale
890 Life expectancy at age 65 for current members aged 45: Abstract stn:LifeExpectancyAtAgeSixtyFiveForCurrentMembersAgedFortyAbstract
891   Male Concept (xbrli:durationItemType) For Period stn:LifeExpectancyAtAgeSixtyFiveForCurrentMembersAgedFortyMale
892   Female Concept (xbrli:durationItemType) For Period stn:LifeExpectancyAtAgeSixtyFiveForCurrentMembersAgedFortyFemale
893 9954530 - Disclosure - Employee Defined Benefit Plans - Schedule of Quantitative Sensitivity Analyses Impact on Defined Benefit Obligation for Significant Assumptions (Details) Network

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 http://www.stantec.com/role/EmployeeDefinedBenefitPlansScheduleofQuantitativeSensitivityAnalysesImpactonDefinedBenefitObligationforSignificantAssumptionsDetails
894 Employee Benefits [Abstract] Abstract stn:EmployeeBenefitsAbstract
895 Disclosure of sensitivity analysis for actuarial assumptions [table] Table ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable
896 Actuarial assumptions [axis] Axis ifrs-full:ActuarialAssumptionsAxis
897 Actuarial assumptions Abstract ifrs-full:ActuarialAssumptionsMember
898 Change in discount rate by 0.25% Abstract stn:ActuarialAssumptionOfDiscountRatesZeroPointTwoFivePercentMember
899 Change in pre-retirement inflation rate by 0.25% Abstract stn:ActuarialAssumptionOfExpectedRatesOfInflationPreRetirementZeroPointTwoFivePercentMember
900 Change in salary growth by 0.25% Abstract stn:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesZeroPointTwoFivePercentMember
901 Change in pension increase assumption by 0.25% Abstract stn:ActuarialAssumptionOfExpectedRatesOfPensionIncreasesZeroPointTwoFivePercentMember
902 Change in one year in the life expectancy Abstract stn:ActuarialAssumptionsOfExpectedIncreaseOfOneYearInLifeExpectancyMember
903 Disclosure of sensitivity analysis for actuarial assumptions [Line Items] LineItems ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
904 Increase Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
905 Decrease Concept (Monetary) As Of Credit ifrs-full:IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption
906 Percentage of increase Concept (dtr-types:percentItemType) As Of ifrs-full:PercentageOfReasonablyPossibleIncreaseInActuarialAssumption
907 Percentage of decrease Concept (dtr-types:percentItemType) As Of ifrs-full:PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
908 9954531 - Disclosure - Other Liabilities (Details) Network

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 http://www.stantec.com/role/OtherLiabilitiesDetails
909 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
910 Cash-settled share-based compensation Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
911 Other Concept (Monetary) As Of Credit stn:MiscellaneousOtherLiabilities
912 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
913 Less current portion Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
914 Long-term portion Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
915 9954531 - Disclosure - Other Liabilities (Details) Network

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 http://www.stantec.com/role/OtherLiabilitiesDetails_1
916 9954532 - Disclosure - Commitments (Details) Network

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 http://www.stantec.com/role/CommitmentsDetails
917 Lease [Abstract] Abstract stn:LeaseAbstract
918 Disclosure of maturity analysis of operating lease payments and purchase obligations [table] Table stn:DisclosureOfMaturityAnalysisOfOperatingLeasePaymentsAndPurchaseObligationsTable
919 Maturity [axis] Axis ifrs-full:MaturityAxis
920 Aggregated time bands Abstract ifrs-full:AggregatedTimeBandsMember
921 Less than 1 Year Abstract ifrs-full:NotLaterThanOneYearMember
922 1 to 3 Years Abstract ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
923 After 3 Years Abstract ifrs-full:LaterThanThreeYearsMember
924 Disclosure of future cash outflows not reflected in measurement of lease liability and purchase obligations [line items] LineItems stn:DisclosureOfFutureCashOutflowsNotReflectedInMeasurementOfLeaseLiabilityAndPurchaseObligationsLineItems
925 Variable lease payments and other Concept (Monetary) As Of Credit stn:LeaseCommitmentsForVariableLeasesForWhichRecognitionExemptionHasBeenUsed
926 Leases not commenced but committed Concept (Monetary) As Of Credit stn:LeasesNotYetCommencedToWhichLesseeIsCommitted
927 Software financing not commenced but committed Concept (Monetary) As Of Credit ifrs-full:ContractualCommitmentsForAcquisitionOfIntangibleAssets
928 Total minimum lease payments Concept (Monetary) As Of Credit stn:Commitments
929 Future minimum payments receivable under non-cancelable sublease agreements Concept (Monetary) As Of Debit stn:UndiscountedLeasePaymentsToBeReceived
930 Sublease receivables Concept (Monetary) As Of Debit ifrs-full:UndiscountedFinanceLeasePaymentsToBeReceived
931 9954533 - Disclosure - Contingencies and Guarantees (Details) Network

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 http://www.stantec.com/role/ContingenciesandGuaranteesDetails
932 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract stn:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
933 Disclosure of contingent liabilities [table] Table ifrs-full:DisclosureOfContingentLiabilitiesTable
934 Classes of contingent liabilities [axis] Axis ifrs-full:ClassesOfContingentLiabilitiesAxis
935 Contingent liabilities Abstract ifrs-full:ContingentLiabilitiesMember
936 Contingent liability for guarantees Abstract ifrs-full:ContingentLiabilityForGuaranteesMember
937 Disclosure of contingent liabilities [line items] LineItems ifrs-full:DisclosureOfContingentLiabilitiesLineItems
938 Accrual of indemnifications or guarantees Concept (Monetary) As Of Debit ifrs-full:EstimatedFinancialEffectOfContingentAssets
939 9954534 - Disclosure - Share Capital - Additional Information (Details) Network

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 http://www.stantec.com/role/ShareCapitalAdditionalInformationDetails
940 Share-Based Payment Arrangements [Abstract] Abstract stn:ShareBasedPaymentArrangementsAbstract
941 Disclosure of terms and conditions of share-based payment arrangement [table] Table ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
942 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
943 Entity's total for related parties Abstract ifrs-full:EntitysTotalForRelatedPartiesMember
944 Officers and employees Abstract stn:OfficersAndEmployeesMember
945 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
946 Share-based payment arrangements Abstract ifrs-full:SharebasedPaymentArrangementsMember
947 RSUs Abstract stn:RestrictedShareUnitsRSUsMember
948 PSUs Abstract stn:PerformanceShareUnitsMember
949 PSUs, excluding dividends Abstract stn:PerformanceShareUnitsPSUsExcludingDividendsMember
950 DSUs, excluding dividends Abstract stn:DeferredShareUnitsDSUsExcludingDividendsMember
951 DSUs Abstract stn:DeferredShareUnitsDSUsMember
952 Performance Share Units (PSUs), Return On Equity Weighting Abstract stn:PerformanceShareUnitsPSUsReturnOnEquityWeightingMember
953 Performance Share Units (PSUs), Total Shareholder Return Weighting Abstract stn:PerformanceShareUnitsPSUsTotalShareholderReturnWeightingMember
954 Vesting [axis] Axis stn:Vesting1Axis
955 Vesting [domain] Abstract stn:Vesting1Domain
956 Estimated historical data Abstract stn:EstimatedHistoricalDataMember
957 Range [axis] Axis ifrs-full:RangeAxis
958 Ranges Abstract ifrs-full:RangesMember
959 Bottom of range Abstract ifrs-full:BottomOfRangeMember
960 Top of range Abstract ifrs-full:TopOfRangeMember
961 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
962 Valuation techniques Abstract ifrs-full:ValuationTechniquesMember
963 Option pricing model Abstract ifrs-full:OptionPricingModelMember
964 Disclosure of range of exercise prices of outstanding share options [line items] LineItems ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems
965 Maximum common shares authorized to be repurchased (in shares) Concept (Shares) As Of stn:NumberOfSharesAuthorizedToBeRepurchasedInStockRepurchaseProgram
966 Common shares repurchased for cancellation (in shares) Concept (Shares) As Of stn:SharesRepurchasedForCancellation
967 Cost of common shares repurchased and cancelled Concept (Monetary) For Period Credit ifrs-full:CancellationOfTreasuryShares
968 Increase (decrease) in number of ordinary shares issued (in shares) Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
969 Treasury price per share (in cad per share) Concept (dtr-types:perShareItemType) As Of ifrs-full:ParValuePerShare
970 Gross proceeds from issuing shares Concept (Monetary) For Period Credit stn:GrossProceedsFromIssuingShares
971 Proceeds from issue of share capital, net of transaction costs Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
972 Dividends declared included in trade and other payables Concept (Monetary) As Of Credit ifrs-full:DividendPayables
973 Net share-based compensation expense Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
974 Expense related to amortization of fair value of options granted Concept (Monetary) For Period Debit ifrs-full:ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
975 Reclassification adjustments on cash flow hedges, net of tax Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax
976 Number of share options outstanding in share-based payment arrangement (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
977 Vesting period for share-based payment arrangement Concept (xbrli:durationItemType) For Period stn:VestingDurationForShareBasedPaymentArrangement
978 Percentage of compensation Concept (dtr-types:percentItemType) As Of stn:PercentageOfCompensationInShares
979 Number of trading days Concept (Integer) As Of stn:NumberOfTradingDays
980 Number of share units granted Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
981 Fair value of share units granted Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
982 Number of units paid Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
983 Payments made for RSUs Concept (Monetary) As Of Credit stn:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsExercisedOrVested
984 Outstanding fair value Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
985 Number of units vest percentage Concept (dtr-types:percentItemType) For Period stn:SharebasedPaymentArrangementVestingRightsPercentage
986 Weighting of the return on equity target Concept (dtr-types:percentItemType) For Period stn:ShareBasedPaymentArrangementEquityInstrumentOtherThanOptionGrantedPercentIncrease
987 Amount of units paid Concept (Monetary) For Period Credit ifrs-full:PaymentsOfOtherEquityInstruments
988 Fair value of outstanding and vested DSUs Concept (Monetary) As Of Credit ifrs-full:IntrinsicValueOfLiabilitiesFromSharebasedPaymentTransactionsForWhichCounterpartysRightToCashOrOtherAssetsVested2011
989 9954535 - Disclosure - Share Capital - Schedule of Dividends Declared and Recorded (Details) Network

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 http://www.stantec.com/role/ShareCapitalScheduleofDividendsDeclaredandRecordedDetails
990 Share-Based Payment Arrangements [Abstract] Abstract stn:ShareBasedPaymentArrangementsAbstract
991 Disclosure of Dividends [table] Table stn:DisclosureOfDividendsTable
992 Classes of ordinary shares [axis] Axis ifrs-full:ClassesOfOrdinarySharesAxis
993 Ordinary Shares Abstract ifrs-full:OrdinarySharesMember
994 Ordinary shares per share, period one Abstract stn:OrdinarySharesPerSharePeriodOneMember
995 Ordinary shares per share, period two Abstract stn:OrdinarySharesPerSharePeriodTwoMember
996 Ordinary shares per share, period three Abstract stn:OrdinarySharesPerSharePeriodThreeMember
997 Ordinary shares per share, period four Abstract stn:OrdinarySharesPerSharePeriodFourMember
998 Ordinary shares per share, period five Abstract stn:OrdinarySharesPerSharePeriodFiveMember
999 Disclosure of Dividends [line items] LineItems stn:DisclosureOfDividendsLineItems
1000 Dividend per Share (in cad per share) Concept (dtr-types:perShareItemType) For Period ifrs-full:DividendsPaidOrdinarySharesPerShare
1001 Paid Concept (Monetary) For Period Debit ifrs-full:DividendsPaidOrdinaryShares
1002 9954536 - Disclosure - Share Capital - Schedule of the Company's RSUs, PSUs, and DSUs (Details) Network

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 http://www.stantec.com/role/ShareCapitalScheduleoftheCompanysRSUsPSUsandDSUsDetails
1003 Share-Based Payment Arrangements [Abstract] Abstract stn:ShareBasedPaymentArrangementsAbstract
1004 Disclosure of number and weighted average remaining contractual life of outstanding share options [table] Table ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable
1005 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1006 Share-based payment arrangements Abstract ifrs-full:SharebasedPaymentArrangementsMember
1007 RSUs Abstract stn:RestrictedShareUnitsRSUsMember
1008 PSUs Abstract stn:PerformanceShareUnitsMember
1009 DSUs Abstract stn:DeferredShareUnitsDSUsMember
1010 Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] LineItems ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsLineItems
1011 Units, beginning of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1012 Granted and adjusted dividends Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1013 Paid Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1014 Forfeited Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1015 Units, end of year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1016 9954537 - Disclosure - Fair Value Measurements - Schedule of Fair Value Hierarchy for Assets (Details) Network

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 http://www.stantec.com/role/FairValueMeasurementsScheduleofFairValueHierarchyforAssetsDetails
1017 Fair Value Measurement [Abstract] Abstract stn:FairValueMeasurementAbstract
1018 Disclosure of fair value measurement of assets [table] Table ifrs-full:DisclosureOfFairValueMeasurementOfAssetsTable
1019 Measurement [axis] Axis ifrs-full:MeasurementAxis
1020 Aggregated measurement Abstract ifrs-full:AggregatedMeasurementMember
1021 Recurring fair value measurement Abstract ifrs-full:RecurringFairValueMeasurementMember
1022 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1023 All levels of fair value hierarchy Abstract ifrs-full:AllLevelsOfFairValueHierarchyMember
1024 Level 1 Abstract ifrs-full:Level1OfFairValueHierarchyMember
1025 Level 2 Abstract ifrs-full:Level2OfFairValueHierarchyMember
1026 Level 3 Abstract ifrs-full:Level3OfFairValueHierarchyMember
1027 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1028 Assets Abstract ifrs-full:ClassesOfAssetsMember
1029 Investments held for self-insured liabilities Abstract stn:InvestmentsHeldForSelfInsuredLiabilitiesMember
1030 Derivative financial instruments Abstract ifrs-full:DerivativesMember
1031 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
1032 Liabilities [member] Abstract ifrs-full:LiabilitiesMember
1033 Notes payable Abstract stn:NotesPayableMember
1034 Derivative financial instruments Abstract ifrs-full:DerivativesMember
1035 Disclosure of fair value measurement of assets and liabilities [line items] LineItems stn:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
1036 Assets Concept (Monetary) As Of Debit ifrs-full:OtherFinancialAssets
1037 Liabilities Concept (Monetary) As Of Credit ifrs-full:OtherFinancialLiabilities
1038 9954538 - Disclosure - Fair Value Measurements - Schedule of Fair Value Hierarchy for Liabilities (Details) Network

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 http://www.stantec.com/role/FairValueMeasurementsScheduleofFairValueHierarchyforLiabilitiesDetails
1039 Fair Value Measurement [Abstract] Abstract stn:FairValueMeasurementAbstract
1040 Disclosure of fair value measurement of liabilities [table] Table ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesTable
1041 Measurement [axis] Axis ifrs-full:MeasurementAxis
1042 Aggregated measurement Abstract ifrs-full:AggregatedMeasurementMember
1043 Not measured at fair value in statement of financial position but for which fair value is disclosed Abstract ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember
1044 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1045 All levels of fair value hierarchy Abstract ifrs-full:AllLevelsOfFairValueHierarchyMember
1046 Level 1 Abstract ifrs-full:Level1OfFairValueHierarchyMember
1047 Level 2 Abstract ifrs-full:Level2OfFairValueHierarchyMember
1048 Level 3 Abstract ifrs-full:Level3OfFairValueHierarchyMember
1049 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
1050 Liabilities [member] Abstract ifrs-full:LiabilitiesMember
1051 Senior unsecured notes Abstract stn:SeniorUnsecuredNotesMember
1052 Disclosure of fair value measurement of liabilities [line items] LineItems ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesLineItems
1053 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1054 9954539 - Disclosure - Financial Instruments - Additional Information (Details) Network

*

*

 http://www.stantec.com/role/FinancialInstrumentsAdditionalInformationDetails
1055 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
1056 Disclosure of detailed information about financial instruments [table] Table ifrs-full:DisclosureOfFinancialInstrumentsTable
1057 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
1058 Hedges Abstract ifrs-full:TypesOfHedgesMember
1059 Interest Rate Swap Abstract stn:InterestRateSwapsMember
1060 Cash flow hedges Abstract ifrs-full:CashFlowHedgesMember
1061 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1062 Financial assets, class Abstract ifrs-full:FinancialAssetsMember
1063 Total Return Swap On Share-Based Compensation Units Abstract stn:TotalReturnSwapOnShareBasedCompensationUnitsMember
1064 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1065 Borrowings by name Abstract ifrs-full:BorrowingsByNameMember
1066 Revolving credit facility Abstract stn:SeniorRevolvingCreditFacilityMember
1067 Credit Facilities Abstract stn:CreditFacilitiesMember
1068 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1069 Share-based payment arrangements Abstract ifrs-full:SharebasedPaymentArrangementsMember
1070 RSUs Abstract stn:RestrictedShareUnitsRSUsMember
1071 PSUs Abstract stn:PerformanceShareUnitsMember
1072 Currency [Axis] Axis srt:CurrencyAxis
1073 All Currencies [Domain] Abstract currency:AllCurrenciesDomain
1074 United States of America, Dollars Abstract currency:USD
1075 Australia, Dollars Abstract currency:AUD
1076 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1077 Financial liabilities, class Abstract ifrs-full:FinancialLiabilitiesMember
1078 Total Return Swap On Share-Based Compensation Units Abstract stn:TotalReturnSwapOnShareBasedCompensationUnitsMember
1079 Disclosure of nature and extent of risks arising from financial instruments [line items] LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
1080 Interest rate swap agreement, amount Concept (Decimal) As Of ifrs-full:NominalAmountOfHedgingInstrument
1081 Reclassification adjustments on cash flow hedges, before tax Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax
1082 Unrealized gain on interest rate swap Concept (Monetary) For Period Credit ifrs-full:GainLossOnChangeInFairValueOfHedgingInstrumentUsedAsBasisForRecognisingHedgeIneffectiveness
1083 Gains on cash flow hedges, net of tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
1084 Gains on change in fair value of derivatives Concept (Monetary) For Period Credit ifrs-full:GainsOnChangeInFairValueOfDerivatives
1085 Unrealized loss on forward contract Concept (Monetary) For Period Debit ifrs-full:LossesOnChangeInFairValueOfDerivatives
1086 Maximum amount of credit risk exposure Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
1087 Number of internal target days of revenue in trade receivables Concept (Integer) As Of stn:NumberOfInternalTargetOfDaysOfRevenueInTradeReceivables
1088 Adjustments in net income resulting from 1% changes in interest rate Concept (Monetary) As Of Credit stn:SensitivityAnalysisOfFairValueProfitLossImpactOf5ChangeInEquityPrices
1089 Adjustments in net income resulting from 10% changes in interest rate Concept (Monetary) As Of Credit stn:SensitivityAnalysisOfFairValuePerformanceSharesImpactOf10ChangeInSharePrice
1090 Amount of revolving credit facility Concept (Monetary) As Of Credit stn:LineOfCreditFacilityMaximumBorrowingsCapacity
1091 Unused capacity of the facility Concept (Monetary) As Of Credit ifrs-full:UndrawnBorrowingFacilities
1092 Additional revolving credit facilities amount Concept (Monetary) As Of Credit stn:LineOfCreditFacilityAdditionalBorrowingsCapacity
1093 Adjustments in net income resulting from 0.5% changes in interest rate Concept (Monetary) For Period Credit stn:SensitivityAnalysisOfFairValueProfitLossImpactOf10ChangeInInterestRateOnBorrowings
1094 9954540 - Disclosure - Financial Instruments - Schedule of Loss Allowance Provision (Details) Network

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*

 http://www.stantec.com/role/FinancialInstrumentsScheduleofLossAllowanceProvisionDetails
1095 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
1096 Disclosure of provision matrix [table] Table ifrs-full:DisclosureOfProvisionMatrixTable
1097 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
1098 Past due status Abstract ifrs-full:PastDueStatusMember
1099 1–30 Abstract ifrs-full:CurrentMember
1100 31–60 Abstract ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember
1101 61–90 Abstract ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
1102 91–120 Abstract ifrs-full:LaterThanThreeMonthsAndNotLaterThanFourMonthsMember
1103 121+ Abstract ifrs-full:LaterThanFourMonthsMember
1104 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1105 Carrying amount Abstract ifrs-full:CarryingAmountMember
1106 Cost Abstract ifrs-full:GrossCarryingAmountMember
1107 Accumulated impairment Abstract ifrs-full:AccumulatedImpairmentMember
1108 Disclosure of provision matrix [line items] LineItems ifrs-full:DisclosureOfProvisionMatrixLineItems
1109 Expected loss rate Concept (dtr-types:percentItemType) As Of ifrs-full:ExpectedCreditLossRate
1110 Gross carrying amount Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1111 Loss allowance provision, end of the year Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
1112 9954541 - Disclosure - Financial Instruments - Schedule of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Details) Network

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*

 http://www.stantec.com/role/FinancialInstrumentsScheduleofTimingofUndiscountedCashOutflowsRelatingtoFinancialLiabilitiesDetails
1113 Financial Instruments [Abstract] Abstract stn:FinancialInstrumentsAbstract
1114 Disclosure of maturity analysis for derivative financial liabilities [table] Table ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable
1115 Maturity [axis] Axis ifrs-full:MaturityAxis
1116 Aggregated time bands Abstract ifrs-full:AggregatedTimeBandsMember
1117 Less than 1 Year Abstract ifrs-full:NotLaterThanOneYearMember
1118 1 to 3 Years Abstract ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1119 After 3 Years Abstract ifrs-full:LaterThanThreeYearsMember
1120 Disclosure of maturity analysis for non-derivative financial liabilities [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
1121 Bank indebtedness Concept (Monetary) As Of Credit ifrs-full:BankBorrowingsUndiscountedCashFlows
1122 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesUndiscountedCashFlows
1123 Lease liabilities Concept (Monetary) As Of Credit ifrs-full:GrossLeaseLiabilities
1124 Long-term debt Concept (Monetary) As Of Credit stn:NonCurrentBorrowingsUndiscountedCashFlows
1125 Other financial liabilities Concept (Monetary) As Of Credit stn:OtherBorrowingsUndiscountedCashFlows
1126 Total contractual obligations Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
1127 9954542 - Disclosure - Capital Management - Schedule of Capital Managed (Details) Network

*

*

 http://www.stantec.com/role/CapitalManagementScheduleofCapitalManagedDetails
1128 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1129 Current portion of long-term debt Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
1130 Non-current portion of long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
1131 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1132 Bank indebtedness Concept (Monetary) As Of Credit ifrs-full:BankOverdraftsClassifiedAsCashEquivalents
1133 Less: cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1134 Net debt Concept (Monetary) As Of Credit ifrs-full:NetDebt
1135 Shareholders’ equity Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
1136 Total capital managed Concept (Monetary) As Of Credit stn:CapitalNetOfCashAndCashEquivalents
1137 9954543 - Disclosure - Capital Management - Additional Information (Details) Network

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*

 http://www.stantec.com/role/CapitalManagementAdditionalInformationDetails
1138 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1139 Disclosure of objectives, policies and processes for managing capital [table] Table ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable
1140 Range [axis] Axis ifrs-full:RangeAxis
1141 Ranges Abstract ifrs-full:RangesMember
1142 Top of range Abstract ifrs-full:TopOfRangeMember
1143 Disclosure of objectives, policies and processes for managing capital [line items] LineItems ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems
1144 Unencumbered cash Concept (Monetary) As Of Debit stn:UnencumberedCashLeverageRatioCovenant
1145 9954544 - Disclosure - Income Taxes - Schedule of Effective Income Tax for Continuing Operations From Statutory Canadian Tax Rates (Details) Network

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*

 http://www.stantec.com/role/IncomeTaxesScheduleofEffectiveIncomeTaxforContinuingOperationsFromStatutoryCanadianTaxRatesDetails
1146 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
1147 Income tax expense at statutory Canadian rates Concept (dtr-types:percentItemType) For Period ifrs-full:ApplicableTaxRate
1148 Increase (decrease) resulting from: Abstract ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
1149 Rate differential on foreign income Concept (dtr-types:percentItemType) For Period ifrs-full:TaxRateEffectOfForeignTaxRates
1150 Research and development and other tax credits Concept (dtr-types:percentItemType) For Period ifrs-full:TaxRateEffectOfRevenuesExemptFromTaxation
1151 Non-deductible expenses and non-taxable income Concept (dtr-types:percentItemType) For Period ifrs-full:TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
1152 Adjustments to prior year tax returns Concept (dtr-types:percentItemType) For Period ifrs-full:TaxRateEffectOfAdjustmentsForCurrentTaxOfPriorPeriods
1153 Other Concept (dtr-types:percentItemType) For Period ifrs-full:OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
1154 Average effective tax rate Concept (dtr-types:percentItemType) For Period ifrs-full:AverageEffectiveTaxRate
1155 9954545 - Disclosure - Income Taxes - Schedule of Major Components of Deferred Income Tax (Recovery) Expense from Continuing Operations (Details) Network

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*

 http://www.stantec.com/role/IncomeTaxesScheduleofMajorComponentsofDeferredIncomeTaxRecoveryExpensefromContinuingOperationsDetails
1156 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
1157 Origination and reversal of timing differences Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences
1158 Unrecognized tax losses and temporary differences Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseArisingFromWritedownOrReversalOfWritedownOfDeferredTaxAsset
1159 Change of tax rates Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToTaxRateChangesOrImpositionOfNewTaxes
1160 Recovery arising from previously unrecognized tax assets Concept (Monetary) For Period Credit ifrs-full:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceDeferredTaxExpense
1161 Deferred income tax recovery Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
1162 9954546 - Disclosure - Income Taxes - Schedule of Significant Components of Net Deferred Income Tax Assets (Liabilities) (Details) Network

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 http://www.stantec.com/role/IncomeTaxesScheduleofSignificantComponentsofNetDeferredIncomeTaxAssetsLiabilitiesDetails
1163 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
1164 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1165 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
1166 Temporary difference, unused tax losses and unused tax credits Abstract ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
1167 Lease liabilities Abstract ifrs-full:LeaseLiabilitiesMember
1168 Differences in timing of taxability of revenue and deductibility of expenses Abstract ifrs-full:TemporaryDifferenceMember
1169 Loss and tax credit carryforwards Abstract stn:UnusedTaxLossesAndCreditsMember
1170 Other Abstract ifrs-full:OtherTemporaryDifferencesMember
1171 Employee defined benefit plan Abstract stn:DeferredTaxDefinedBenefitObligationMember
1172 Carrying value of property and equipment in excess of tax cost Abstract ifrs-full:PropertyPlantAndEquipmentMember
1173 Carrying value of intangible assets in excess of tax cost Abstract ifrs-full:IntangibleAssetsOtherThanGoodwillMember
1174 Lease assets Abstract ifrs-full:RightofuseAssetsMember
1175 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
1176 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
1177 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1178 Deferred tax assets (liabilities) Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1179 9954547 - Disclosure - Income Taxes - Schedule of Reconciliation of Net Deferred Tax Assets (Liabilities) (Details) Network

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*

 http://www.stantec.com/role/IncomeTaxesScheduleofReconciliationofNetDeferredTaxAssetsLiabilitiesDetails
1180 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
1181 Reconciliation of changes in deferred tax liability (asset) [abstract] Abstract ifrs-full:ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract
1182 Balance, beginning of the year Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1183 Tax effect on equity items Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
1184 Impact of foreign exchange Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset
1185 Deferred taxes acquired through business combinations Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
1186 Tax recovery during the year recognized in net income Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
1187 Balance, end of the year Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1188 9954548 - Disclosure - Income Taxes - Schedule of Loss Carryforwards and Deductible Temporary Differences (Details) Network

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*

 http://www.stantec.com/role/IncomeTaxesScheduleofLossCarryforwardsandDeductibleTemporaryDifferencesDetails
1189 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
1190 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1191 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
1192 Temporary difference, unused tax losses and unused tax credits Abstract ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
1193 Non-capital tax losses Abstract stn:NonCapitalTaxLossesMember
1194 Capital tax losses Abstract stn:CapitalTaxLossesMember
1195 Non-capital and capital tax losses Abstract ifrs-full:TemporaryDifferenceMember
1196 Maturity [axis] Axis ifrs-full:MaturityAxis
1197 Aggregated time bands Abstract ifrs-full:AggregatedTimeBandsMember
1198 Expire (2024 to 2043) Abstract stn:ExpireMember
1199 Never expire Abstract stn:NeverExpireMember
1200 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
1201 Deductible temporary differences Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
1202 Non-capital and capital tax losses Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
1203 9954549 - Disclosure - Income Taxes - Additional Information (Details) Network

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*

 http://www.stantec.com/role/IncomeTaxesAdditionalInformationDetails
1204 Income Taxes [Abstract] Abstract stn:IncomeTaxesAbstract
1205 Current Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
1206 Unused tax credits for which no deferred tax asset recognised Concept (Monetary) As Of ifrs-full:UnusedTaxCreditsForWhichNoDeferredTaxAssetRecognised
1207 9954550 - Disclosure - Net Interest Expense and Other Net Finance Expense - Schedule of Interest Expense (Details) Network

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*

 http://www.stantec.com/role/NetInterestExpenseandOtherNetFinanceExpenseScheduleofInterestExpenseDetails
1208 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1209 Disclosure of attribution of expenses by nature to their function [table] Table ifrs-full:DisclosureOfAttributionOfExpensesByNatureToTheirFunctionTable
1210 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1211 Financial instruments, class Abstract ifrs-full:ClassesOfFinancialInstrumentsMember
1212 Senior unsecured notes Abstract stn:SeniorUnsecuredNotesMember
1213 Disclosure of attribution of expenses by nature to their function [line items] LineItems ifrs-full:DisclosureOfAttributionOfExpensesByNatureToTheirFunctionLineItems
1214 Interest on credit facilities Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBorrowings
1215 Interest on lease liabilities Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnLeaseLiabilities
1216 Interest on senior unsecured notes Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBonds
1217 Other Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
1218 Total interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
1219 Total interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
1220 Net interest expense Concept (Monetary) For Period Credit stn:InterestIncomeExpenseExcludingOtherFinanceIncomeCost
1221 Other net finance expense Concept (Monetary) For Period Credit ifrs-full:OtherFinanceIncomeCost
1222 Net interest expense and other net finance expense Concept (Monetary) For Period Credit ifrs-full:InterestRevenueExpense
1223 9954551 - Disclosure - Net Interest Expense and Other Net Finance Expense - Schedule of Other Net Finance Expense (Details) Network

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*

 http://www.stantec.com/role/NetInterestExpenseandOtherNetFinanceExpenseScheduleofOtherNetFinanceExpenseDetails
1224 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1225 Bank and similar charges Concept (Monetary) For Period Debit ifrs-full:BankAndSimilarCharges
1226 Miscellaneous other finance expense (income) Concept (Monetary) For Period Debit stn:MiscellaneousOtherFinanceExpenseIncome
1227 Net interest expense and other net finance expense Concept (Monetary) For Period Debit ifrs-full:OtherFinanceCost
1228 9954552 - Disclosure - Revenue (Details) Network

*

*

 http://www.stantec.com/role/RevenueDetails
1229 Revenue From Contracts With Customers [Abstract] Abstract stn:RevenueFromContractsWithCustomersAbstract
1230 Number of specialized business operating units Concept (Integer) As Of stn:NumberOfSpecializedBusinessOperatingUnits
1231 Contract liabilities recognised as of acquisition date Concept (Monetary) As Of Credit ifrs-full:ContractLiabilitiesRecognisedAsOfAcquisitionDate
1232 Deferred revenue Concept (Monetary) For Period Credit ifrs-full:RevenueThatWasIncludedInContractLiabilityBalanceAtBeginningOfPeriod
1233 Percentage of gross revenue Concept (dtr-types:percentItemType) For Period ifrs-full:PercentageOfEntitysRevenue
1234 Revenue from performance obligations unsatisfied (or partially unsatisfied) Concept (Monetary) As Of Credit ifrs-full:TransactionPriceAllocatedToRemainingPerformanceObligations
1235 Expected revenue recognition as contracts are completed Concept (dtr-types:percentItemType) For Period stn:PercentageThatEntityExpectsToRecogniseTransactionPriceAllocatedToRemainingPerformanceObligationsAsRevenue
1236 Timing expected to recognize revenue as contracts are completed Concept (xbrli:durationItemType) For Period stn:TimingOfSatisfactionOfPerformanceObligationsRelatesToTypicalTimingOfPayment
1237 9954553 - Disclosure - Employee Costs - Schedule of Employee Benefits Cost (Details) Network

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*

 http://www.stantec.com/role/EmployeeCostsScheduleofEmployeeBenefitsCostDetails
1238 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1239 Wages, salaries, and benefits Concept (Monetary) For Period Debit ifrs-full:ShorttermEmployeeBenefitsExpense
1240 Pension costs Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseInProfitOrLoss
1241 Net share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1242 Total employee costs Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
1243 Direct labor Concept (Monetary) For Period Debit stn:DirectLaborCosts
1244 Indirect labor Concept (Monetary) For Period Debit stn:IndirectLaborCosts
1245 9954553 - Disclosure - Employee Costs - Schedule of Employee Benefits Cost (Details) Network

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*

 http://www.stantec.com/role/EmployeeCostsScheduleofEmployeeBenefitsCostDetails_1
1246 9954554 - Disclosure - Employee Costs - Additional Information (Details) Network

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*

 http://www.stantec.com/role/EmployeeCostsAdditionalInformationDetails
1247 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1248 Pension cost Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
1249 9954555 - Disclosure - Other Income (Details) Network

*

*

 http://www.stantec.com/role/OtherIncomeDetails
1250 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1251 Realized gain on equity securities Concept (Monetary) For Period Credit stn:RealizedGainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
1252 Unrealized (gain) loss on equity securities Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValue
1253 Gain on disposition of intangible asset Concept (Monetary) For Period Credit stn:GainLossOnDispositionOfIntangibleAsset
1254 Foreign exchange loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
1255 Net impairment (reversal) of lease assets and property and equipment Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
1256 Net impairment (reversal) of lease assets and property and equipment Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLoss
1257 Other Concept (Monetary) For Period Credit stn:MiscellaneousOtherIncomeExpense
1258 Total other income Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
1259 9954556 - Disclosure - Weighted Average Shares Outstanding - Schedule of Basic and Diluted Common Shares Outstanding, Calculated on Weighted Average Basis (Details) Network

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*

 http://www.stantec.com/role/WeightedAverageSharesOutstandingScheduleofBasicandDilutedCommonSharesOutstandingCalculatedonWeightedAverageBasisDetails
1260 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
1261 Basic shares outstanding (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
1262 Share options (dilutive effect) (in shares) Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1263 Diluted shares (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
1264 Number of dilutive options Concept (Integer) For Period stn:NumberOfShareOptionsWithDilutiveEffect
1265 9954557 - Disclosure - Weighted Average Shares Outstanding - Additional Information (Details) Network

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*

 http://www.stantec.com/role/WeightedAverageSharesOutstandingAdditionalInformationDetails
1266 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
1267 Antidilutive options (in shares) Concept (Shares) For Period stn:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1
1268 9954558 - Disclosure - Cash Flow Information - Schedule of Roll Forward (Details) Network

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 http://www.stantec.com/role/CashFlowInformationScheduleofRollForwardDetails
1269 Cash Flow Statement [Abstract] Abstract stn:CashFlowStatementAbstract
1270 Disclosure of reconciliation of liabilities arising from financing activities [table] Table ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
1271 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1272 Borrowings by name Abstract ifrs-full:BorrowingsByNameMember
1273 Senior unsecured notes Abstract stn:SeniorUnsecuredNotesMember
1274 Revolving credit facility Abstract stn:SeniorRevolvingCreditFacilityMember
1275 Notes payable Abstract stn:NotesPayableMember
1276 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1277 Liabilities arising from financing activities Abstract ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
1278 Software financing obligations Abstract stn:SoftwareFinancingObligationsMember
1279 Lease liabilities Abstract ifrs-full:LeaseLiabilitiesMember
1280 Disclosure of reconciliation of liabilities arising from financing activities [line items] LineItems ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
1281 Beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1282 Net proceeds (repayments) Concept (Monetary) For Period Credit stn:IncreaseDecreaseThroughProceedsLiabilitiesArisingFromFinancingActivities
1283 Transaction costs Concept (Monetary) For Period Credit stn:IncreaseDecreaseThroughTransactionCostsLiabilitiesArisingFromFinancingActivities
1284 Non-cash changes Abstract ifrs-full:ChangesInLiabilitiesArisingFromFinancingActivitiesAbstract
1285 Foreign exchange Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
1286 Additions and modifications Concept (Monetary) For Period Credit stn:IncreaseDecreaseThroughNewLiabilitiesArisingFromFinancingActivities
1287 Other Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
1288 Ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1289 9954559 - Disclosure - Cash Flow Information - Schedule of Net Cash Flows from Operating Activities (Details) Network

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 http://www.stantec.com/role/CashFlowInformationScheduleofNetCashFlowsfromOperatingActivitiesDetails
1290 Cash Flow Statement [Abstract] Abstract stn:CashFlowStatementAbstract
1291 Income taxes paid, net of recoveries Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
1292 Interest paid, net of receipts Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsOperatingActivities
1293 9954560 - Disclosure - Cash Flow Information - Schedule of Amounts Recognized in the Consolidated Statement of Cash Flows (Details) Network

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 http://www.stantec.com/role/CashFlowInformationScheduleofAmountsRecognizedintheConsolidatedStatementofCashFlowsDetails
1294 Cash Flow Statement [Abstract] Abstract stn:CashFlowStatementAbstract
1295 Cash payments for the interest portion of lease liabilities Concept (Monetary) For Period Credit stn:InterestPaymentsOfLeaseLiabilities
1296 Cash payments for leases not included in the measurement of lease liabilities Concept (Monetary) For Period Credit stn:CashPaymentsForLeasesNotIncludedInTheMeasurementOfLeaseLiabilities
1297 Cash used in operating activities Concept (Monetary) For Period Credit stn:CashFlowsUsedInOperatingActivitiesForLeases
1298 Repayments or payments Concept (Monetary) For Period Credit ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities
1299 Net cash used in financing activities Concept (Monetary) For Period Credit stn:CashFlowsUsedInFinancingActivitiesForLeases
1300 Total cash used for leases Concept (Monetary) For Period Credit ifrs-full:CashOutflowForLeases
1301 9954561 - Disclosure - Related-Party Disclosures - Additional Information (Details) Network

*

*

 http://www.stantec.com/role/RelatedPartyDisclosuresAdditionalInformationDetails
1302 Related Party [Abstract] Abstract stn:RelatedPartyAbstract
1303 Disclosure of subsidiaries [table] Table ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1304 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1305 Entity's total for subsidiaries Abstract ifrs-full:EntitysTotalForSubsidiariesMember
1306 Wholly owned subsidiaries Abstract stn:WhollyOwnedSubsidiariesMember
1307 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1308 Ownership of voting and restricted securities Concept (dtr-types:percentItemType) For Period ifrs-full:ProportionOfVotingPowerHeldInSubsidiary
1309 9954562 - Disclosure - Related-Party Disclosures - Schedule of Joint Operations (Details) Network

*

*

 http://www.stantec.com/role/RelatedPartyDisclosuresScheduleofJointOperationsDetails
1310 Related Party [Abstract] Abstract stn:RelatedPartyAbstract
1311 Disclosure of joint operations [table] Table ifrs-full:DisclosureOfJointOperationsTable
1312 Joint Operations By Name [Axis] Axis stn:JointOperationsByNameAxis
1313 Joint Operations By Name [Domain] Abstract stn:JointOperationsByNameDomain
1314 Starr ll, a Joint Venture Abstract stn:StarrIIMember
1315 WSM Pacific SIOP Abstract stn:WSMPacificSIOPMember
1316 Better Together, a Joint Venture Abstract stn:BetterTogetherMember
1317 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
1318 Entity's total for joint operations [member] Abstract ifrs-full:EntitysTotalForJointOperationsMember
1319 Joint operations Abstract ifrs-full:JointOperationsMember
1320 Disclosure of joint operations [line items] LineItems ifrs-full:DisclosureOfJointOperationsLineItems
1321 Ownership Interests Concept (dtr-types:percentItemType) For Period ifrs-full:ProportionOfOwnershipInterestInJointOperation
1322 9954563 - Disclosure - Related-Party Disclosures - Schedule of Transactions with Joint Ventures (Details) Network

*

*

 http://www.stantec.com/role/RelatedPartyDisclosuresScheduleofTransactionswithJointVenturesDetails
1323 Related Party [Abstract] Abstract stn:RelatedPartyAbstract
1324 Disclosure Of Joint Ventures And Associates [table] Table ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1325 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1326 Entity's total for related parties Abstract ifrs-full:EntitysTotalForRelatedPartiesMember
1327 Joint ventures Abstract ifrs-full:JointVenturesWhereEntityIsVenturerMember
1328 Disclosure of transactions between related parties [Line Items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1329 Sales to Related Parties Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfGoodsRelatedPartyTransactions
1330 Distributions Paid Concept (Monetary) For Period Credit stn:PaymentsOfDistributionRelatedPartyTransactions
1331 Amounts Owed by Related Parties Concept (Monetary) As Of Credit ifrs-full:AmountsPayableRelatedPartyTransactions
1332 9954564 - Disclosure - Related-Party Disclosures - Schedule of Compensation of Key Management Personnel and Directors of the Company (Details) Network

*

*

 http://www.stantec.com/role/RelatedPartyDisclosuresScheduleofCompensationofKeyManagementPersonnelandDirectorsoftheCompanyDetails
1333 Related Party [Abstract] Abstract stn:RelatedPartyAbstract
1334 Salaries and other short-term employment benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1335 Directors’ fees Concept (Monetary) For Period Debit ifrs-full:DirectorsRemunerationExpense
1336 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1337 Total compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1338 9954565 - Disclosure - Segmented Information - Schedule of Operating Segments (Details) Network

*

*

 http://www.stantec.com/role/SegmentedInformationScheduleofOperatingSegmentsDetails
1339 Operating Segments [Abstract] Abstract stn:OperatingSegmentsAbstract
1340 Disclosure of operating segments [table] Table ifrs-full:DisclosureOfOperatingSegmentsTable
1341 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1342 Geographical areas Abstract ifrs-full:GeographicalAreasMember
1343 Canada Abstract country:CA
1344 United States Abstract country:US
1345 Foreign countries [member] Abstract ifrs-full:ForeignCountriesMember
1346 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1347 Entity's total for segment consolidation items [member] Abstract ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1348 Operating Segments Abstract ifrs-full:OperatingSegmentsMember
1349 Adjustments and Eliminations Abstract ifrs-full:EliminationOfIntersegmentAmountsMember
1350 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1351 Gross revenue from external customers Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
1352 Less subconsultant and other direct expenses Concept (Monetary) For Period Debit stn:SubconsultantSubcontractorAndOtherDirectExpenses
1353 Net revenue Concept (Monetary) For Period Credit stn:NetRevenue
1354 Project margin Concept (Monetary) For Period Credit ifrs-full:GrossProfit
1355 9954566 - Disclosure - Segmented Information - Schedule of Non-Current Assets and Gross Revenue by Geographical Areas (Details) Network

*

*

 http://www.stantec.com/role/SegmentedInformationScheduleofNonCurrentAssetsandGrossRevenuebyGeographicalAreasDetails
1356 Operating Segments [Abstract] Abstract stn:OperatingSegmentsAbstract
1357 Disclosure of geographical areas [table] Table ifrs-full:DisclosureOfGeographicalAreasTable
1358 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1359 Geographical areas Abstract ifrs-full:GeographicalAreasMember
1360 Canada Abstract country:CA
1361 United States Abstract country:US
1362 United Kingdom (revised) Abstract country:GB
1363 Australia Abstract country:AU
1364 Other global geographies (revised) Abstract stn:OtherCountriesMember
1365 Disclosure of geographical areas [line items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
1366 Non-Current Assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts
1367 Gross Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
1368 9954567 - Disclosure - Segmented Information - Additional Information (Details) Network

*

*

 http://www.stantec.com/role/SegmentedInformationAdditionalInformationDetails
1369 Operating Segments [Abstract] Abstract stn:OperatingSegmentsAbstract
1370 Disclosure of geographical areas [table] Table ifrs-full:DisclosureOfGeographicalAreasTable
1371 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1372 Geographical areas Abstract ifrs-full:GeographicalAreasMember
1373 United Kingdom Abstract country:GB
1374 Other global geographies Abstract stn:OtherCountriesMember
1375 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
1376 Currently stated Abstract ifrs-full:RestatedMember
1377 Previously stated Abstract ifrs-full:PreviouslyStatedMember
1378 Increase (decrease) due to corrections of prior period errors Abstract ifrs-full:FinancialEffectOfCorrectionsOfAccountingErrorsMember
1379 Disclosure of geographical areas [line items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
1380 Gross revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
1381 9954568 - Disclosure - Segmented Information - Schedule of Gross Revenue by Services (Details) Network

*

*

 http://www.stantec.com/role/SegmentedInformationScheduleofGrossRevenuebyServicesDetails
1382 Operating Segments [Abstract] Abstract stn:OperatingSegmentsAbstract
1383 Disclosure of geographical areas [table] Table ifrs-full:DisclosureOfGeographicalAreasTable
1384 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
1385 Products and services Abstract ifrs-full:ProductsAndServicesMember
1386 Infrastructure Abstract stn:InfrastructureMember
1387 Environmental Services Abstract stn:EnvironmentalServicesMember
1388 Water Abstract stn:WaterServicesMember
1389 Buildings Abstract stn:BuildingsServicesMember
1390 Energy & Resources Abstract stn:EnergyAndResourcesServicesMember
1391 Disclosure of products and services [line items] LineItems ifrs-full:DisclosureOfProductsAndServicesLineItems
1392 Gross revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
1393 9954569 - Disclosure - Investment Tax Credit (Details) Network

*

*

 http://www.stantec.com/role/InvestmentTaxCreditDetails
1394 Investment Tax Credits [Abstract] Abstract stn:InvestmentTaxCreditsAbstract
1395 Investment tax credits Concept (Monetary) For Period Credit stn:InvestmentTaxCredits
1396 9954570 - Disclosure - Events after the Reporting Period (Details) Network

*

*

 http://www.stantec.com/role/EventsaftertheReportingPeriodDetails
1397 Events After Reporting Period [Abstract] Abstract stn:EventsAfterReportingPeriodAbstract
1398 Disclosure of non-adjusting events after reporting period [table] Table ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodTable
1399 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1400 Non-adjusting events after reporting period Abstract ifrs-full:NonadjustingEventsMember
1401 Acquisitions Abstract stn:AcquisitionsMember
1402 Dividend declaration transactions Abstract stn:DividendDeclarationTransactionsMember
1403 Disclosure of non-adjusting events after reporting period [Line Items] LineItems ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
1404 Consideration paid (received) Concept (Monetary) For Period Credit ifrs-full:ConsiderationPaidReceived
1405 Dividends payable amount per share (in cad per share) Concept (dtr-types:perShareItemType) For Period ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
1406 Consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
1407 http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists Network

*

*

 http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists
1408 http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists Network

*

*

 http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists
1409 http://xbrl.sec.gov/ecd/AwardTypeOnly Network

*

*

 http://xbrl.sec.gov/ecd/AwardTypeOnly
1410 http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure Network

*

*

 http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure
1411 Award Timing Disclosures [Line Items] LineItems ecd:AwardTmgDiscLineItems
1412 Award Timing MNPI Disclosure Concept (dtr-types:textBlockItemType) For Period ecd:AwardTmgMnpiDiscTextBlock
1413 Award Timing Method Concept (dtr-types:textBlockItemType) For Period ecd:AwardTmgMethodTextBlock
1414 Award Timing Predetermined Concept (Yes/No) For Period ecd:AwardTmgPredtrmndFlag
1415 Award Timing MNPI Considered Concept (Yes/No) For Period ecd:AwardTmgMnpiCnsdrdFlag
1416 Award Timing, How MNPI Considered Concept (dtr-types:textBlockItemType) For Period ecd:AwardTmgHowMnpiCnsdrdTextBlock
1417 MNPI Disclosure Timed for Compensation Value Concept (Yes/No) For Period ecd:MnpiDiscTimedForCompValFlag
1418 Awards Close in Time to MNPI Disclosures, Table Concept (dtr-types:textBlockItemType) For Period ecd:AwardsCloseToMnpiDiscTableTextBlock
1419 Awards Close in Time to MNPI Disclosures Table ecd:AwardsCloseToMnpiDiscTable
1420 Individual: Axis ecd:IndividualAxis
1421 All Individuals Abstract ecd:AllIndividualsMember
1422 Award Type Axis us-gaap:AwardTypeAxis
1423 All Award Types Abstract us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain
1424 Employee Stock Option Abstract us-gaap:EmployeeStockOptionMember
1425 Stock Appreciation Rights (SARs) Abstract us-gaap:StockAppreciationRightsSARSMember
1426 Name Concept (Text/String) As Of ecd:AwardsCloseToMnpiDiscIndName
1427 Underlying Securities Concept (Decimal) As Of ecd:AwardUndrlygSecuritiesAmt
1428 Exercise Price Concept (dtr-types:perShareItemType) As Of ecd:AwardExrcPrice
1429 Fair Value as of Grant Date Concept (Monetary) As Of ecd:AwardGrantDateFairValue
1430 Underlying Security Market Price Change Concept (Pure) As Of ecd:UndrlygSecurityMktPriceChngPct
1431 http://xbrl.sec.gov/ecd/role/AwardsCloseToMnpiDisc Network

*

*

 http://xbrl.sec.gov/ecd/role/AwardsCloseToMnpiDisc
1432 http://xbrl.sec.gov/ecd/role/Defaults Network

*

*

 http://xbrl.sec.gov/ecd/role/Defaults
1433 http://xbrl.sec.gov/ecd/role/ErrCompDisclosure Network

*

*

 http://xbrl.sec.gov/ecd/role/ErrCompDisclosure
1434 Recovery of Erroneously Awarded Compensation Disclosure [Line Items] LineItems ecd:RecoveryOfErrCompDisclosureLineItems
1435 Erroneously Awarded Compensation Recovery Table ecd:ErrCompRecoveryTable
1436 Restatement Determination Date: Axis ecd:RestatementDateAxis
1437 Individual: Axis ecd:IndividualAxis
1438 All Individuals Abstract ecd:AllIndividualsMember
1439 Non-NEOs Abstract ecd:NonNeosMember
1440 Restatement Determination Date Concept (Date) For Period ecd:RestatementDeterminationDate
1441 Aggregate Erroneous Compensation Amount Concept (Monetary) As Of ecd:AggtErrCompAmt
1442 Erroneous Compensation Analysis Concept (dtr-types:textBlockItemType) For Period ecd:ErrCompAnalysisTextBlock
1443 Stock Price or TSR Estimation Method Concept (dtr-types:textBlockItemType) For Period ecd:StkPrcOrTsrEstimationMethodTextBlock
1444 Outstanding Aggregate Erroneous Compensation Amount Concept (Monetary) As Of ecd:OutstandingAggtErrCompAmt
1445 Aggregate Erroneous Compensation Not Yet Determined Concept (dtr-types:textBlockItemType) For Period ecd:AggtErrCompNotYetDeterminedTextBlock
1446 Name Concept (Text/String) For Period ecd:ForgoneRecoveryIndName
1447 Forgone Recovery due to Expense of Enforcement, Amount Concept (Monetary) For Period ecd:ForgoneRecoveryDueToExpenseOfEnforcementAmt
1448 Forgone Recovery due to Violation of Home Country Law, Amount Concept (Monetary) For Period ecd:ForgoneRecoveryDueToViolationOfHomeCountryLawAmt
1449 Forgone Recovery due to Disqualification of Tax Benefits, Amount Concept (Monetary) For Period ecd:ForgoneRecoveryDueToDisqualificationOfTaxBenefitsAmt
1450 Forgone Recovery, Explanation of Impracticability Concept (dtr-types:textBlockItemType) For Period ecd:ForgoneRecoveryExplanationOfImpracticabilityTextBlock
1451 Name Concept (Text/String) For Period ecd:OutstandingRecoveryIndName
1452 Compensation Amount Concept (Monetary) As Of ecd:OutstandingRecoveryCompAmt
1453 Restatement does not require Recovery Concept (dtr-types:textBlockItemType) For Period ecd:RestatementDoesNotRequireRecoveryTextBlock
1454 http://xbrl.sec.gov/ecd/role/ForgoneRecoveries Network

*

*

 http://xbrl.sec.gov/ecd/role/ForgoneRecoveries
1455 http://xbrl.sec.gov/ecd/role/IndividualsOnly Network

*

*

 http://xbrl.sec.gov/ecd/role/IndividualsOnly
1456 http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Network

*

*

 http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements
1457 Insider Trading Arrangements [Line Items] LineItems ecd:InsiderTradingArrLineItems
1458 Trading Arrangements, by Individual Table ecd:TradingArrByIndTable
1459 Trading Arrangement: Axis ecd:TradingArrAxis
1460 All Trading Arrangements Abstract ecd:AllTradingArrangementsMember
1461 Individual: Axis ecd:IndividualAxis
1462 All Individuals Abstract ecd:AllIndividualsMember
1463 Material Terms of Trading Arrangement Concept (dtr-types:textBlockItemType) For Period ecd:MtrlTermsOfTrdArrTextBlock
1464 Name Concept (Text/String) For Period ecd:TrdArrIndName
1465 Title Concept (Text/String) For Period ecd:TrdArrIndTitle
1466 Rule 10b5-1 Arrangement Adopted Concept (Yes/No) For Period ecd:Rule10b51ArrAdoptedFlag
1467 Non-Rule 10b5-1 Arrangement Adopted Concept (Yes/No) For Period ecd:NonRule10b51ArrAdoptedFlag
1468 Adoption Date Concept (Text/String) For Period ecd:TrdArrAdoptionDate
1469 Rule 10b5-1 Arrangement Terminated Concept (Yes/No) For Period ecd:Rule10b51ArrTrmntdFlag
1470 Non-Rule 10b5-1 Arrangement Terminated Concept (Yes/No) For Period ecd:NonRule10b51ArrTrmntdFlag
1471 Termination Date Concept (Text/String) For Period ecd:TrdArrTerminationDate
1472 Arrangement Duration Concept (xbrli:durationItemType) For Period ecd:TrdArrDuration
1473 Aggregate Available Concept (Shares) As Of ecd:TrdArrSecuritiesAggAvailAmt
1474 http://xbrl.sec.gov/ecd/role/InsiderTradingArrangementsByInd Network

*

*

 http://xbrl.sec.gov/ecd/role/InsiderTradingArrangementsByInd
1475 http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Network

*

*

 http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc
1476 Insider Trading Policies and Procedures [Line Items] LineItems ecd:InsiderTradingPoliciesProcLineItems
1477 Insider Trading Policies and Procedures Adopted Concept (Yes/No) For Period ecd:InsiderTrdPoliciesProcAdoptedFlag
1478 Insider Trading Policies and Procedures Not Adopted Concept (dtr-types:textBlockItemType) For Period ecd:InsiderTrdPoliciesProcNotAdoptedTextBlock
1479 http://xbrl.sec.gov/ecd/role/OutstandingRecoveries Network

*

*

 http://xbrl.sec.gov/ecd/role/OutstandingRecoveries
1480 http://xbrl.sec.gov/ecd/role/PvpAdjustmentsOnly Network

*

*

 http://xbrl.sec.gov/ecd/role/PvpAdjustmentsOnly
1481 http://xbrl.sec.gov/ecd/role/PvpAdjustmentsToCompensation Network

*

*

 http://xbrl.sec.gov/ecd/role/PvpAdjustmentsToCompensation
1482 http://xbrl.sec.gov/ecd/role/PvpDisclosure Network

*

*

 http://xbrl.sec.gov/ecd/role/PvpDisclosure
1483 Pay vs Performance Disclosure [Line Items] LineItems ecd:PayVsPerformanceDisclosureLineItems
1484 Pay vs Performance Disclosure Table ecd:PvpTable
1485 Executive Category: Axis ecd:ExecutiveCategoryAxis
1486 All Executive Categories Abstract ecd:AllExecutiveCategoriesMember
1487 PEO Abstract ecd:PeoMember
1488 Non-PEO NEO Abstract ecd:NonPeoNeoMember
1489 Individual: Axis ecd:IndividualAxis
1490 All Individuals Abstract ecd:AllIndividualsMember
1491 Adjustment to Compensation: Axis ecd:AdjToCompAxis
1492 All Adjustments to Compensation Abstract ecd:AllAdjToCompMember
1493 Measure: Axis ecd:MeasureAxis
1494 Pay vs Performance Disclosure, Table Concept (dtr-types:textBlockItemType) For Period ecd:PvpTableTextBlock
1495 Company Selected Measure Name Concept (Text/String) For Period ecd:CoSelectedMeasureName
1496 Named Executive Officers, Footnote Concept (dtr-types:textBlockItemType) For Period ecd:NamedExecutiveOfficersFnTextBlock
1497 Peer Group Issuers, Footnote Concept (dtr-types:textBlockItemType) For Period ecd:PeerGroupIssuersFnTextBlock
1498 Changed Peer Group, Footnote Concept (dtr-types:textBlockItemType) For Period ecd:ChangedPeerGroupFnTextBlock
1499 PEO Total Compensation Amount Concept (Monetary) For Period ecd:PeoTotalCompAmt
1500 PEO Actually Paid Compensation Amount Concept (Monetary) For Period ecd:PeoActuallyPaidCompAmt
1501 Adjustment To PEO Compensation, Footnote Concept (dtr-types:textBlockItemType) For Period ecd:AdjToPeoCompFnTextBlock
1502 Non-PEO NEO Average Total Compensation Amount Concept (Monetary) For Period ecd:NonPeoNeoAvgTotalCompAmt
1503 Non-PEO NEO Average Compensation Actually Paid Amount Concept (Monetary) For Period ecd:NonPeoNeoAvgCompActuallyPaidAmt
1504 Adjustment to Non-PEO NEO Compensation Footnote Concept (dtr-types:textBlockItemType) For Period ecd:AdjToNonPeoNeoCompFnTextBlock
1505 Equity Valuation Assumption Difference, Footnote Concept (dtr-types:textBlockItemType) For Period ecd:EquityValuationAssumptionDifferenceFnTextBlock
1506 Compensation Actually Paid vs. Total Shareholder Return Concept (dtr-types:textBlockItemType) For Period ecd:CompActuallyPaidVsTotalShareholderRtnTextBlock
1507 Compensation Actually Paid vs. Net Income Concept (dtr-types:textBlockItemType) For Period ecd:CompActuallyPaidVsNetIncomeTextBlock
1508 Compensation Actually Paid vs. Company Selected Measure Concept (dtr-types:textBlockItemType) For Period ecd:CompActuallyPaidVsCoSelectedMeasureTextBlock
1509 Total Shareholder Return Vs Peer Group Concept (dtr-types:textBlockItemType) For Period ecd:TotalShareholderRtnVsPeerGroupTextBlock
1510 Compensation Actually Paid vs. Other Measure Concept (dtr-types:textBlockItemType) For Period ecd:CompActuallyPaidVsOtherMeasureTextBlock
1511 Tabular List, Table Concept (dtr-types:textBlockItemType) For Period ecd:TabularListTableTextBlock
1512 Total Shareholder Return Amount Concept (Monetary) For Period ecd:TotalShareholderRtnAmt
1513 Peer Group Total Shareholder Return Amount Concept (Monetary) For Period ecd:PeerGroupTotalShareholderRtnAmt
1514 Net Income (Loss) Concept (Monetary) For Period Credit us-gaap:NetIncomeLoss
1515 Company Selected Measure Amount Concept (Decimal) For Period ecd:CoSelectedMeasureAmt
1516 Other Performance Measure, Amount Concept (Decimal) For Period ecd:OtherPerfMeasureAmt
1517 Adjustment to Compensation, Amount Concept (Monetary) For Period ecd:AdjToCompAmt
1518 PEO Name Concept (Text/String) For Period ecd:PeoName
1519 Name Concept (Text/String) For Period ecd:MeasureName
1520 Non-GAAP Measure Description Concept (dtr-types:textBlockItemType) For Period ecd:NonGaapMeasureDescriptionTextBlock
1521 Additional 402(v) Disclosure Concept (dtr-types:textBlockItemType) For Period ecd:Additional402vDisclosureTextBlock
1522 http://xbrl.sec.gov/ecd/role/PvpDisclosureWithAdditionalMeasures Network

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*

 http://xbrl.sec.gov/ecd/role/PvpDisclosureWithAdditionalMeasures
1523 http://xbrl.sec.gov/ecd/role/PvpExecutiveCategoriesOnly Network

*

*

 http://xbrl.sec.gov/ecd/role/PvpExecutiveCategoriesOnly
1524 http://xbrl.sec.gov/ecd/role/PvpMeasures Network

*

*

 http://xbrl.sec.gov/ecd/role/PvpMeasures
1525 http://xbrl.sec.gov/ecd/role/PvpTable Network

*

*

 http://xbrl.sec.gov/ecd/role/PvpTable
1526 http://xbrl.sec.gov/ecd/role/TabularListMeasures Network

*

*

 http://xbrl.sec.gov/ecd/role/TabularListMeasures
1527 http://xbrl.sec.gov/ecd/role/TabularListsByExecutiveCategory Network

*

*

 http://xbrl.sec.gov/ecd/role/TabularListsByExecutiveCategory
1528 http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly Network

*

*

 http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly

8/6/2024 7:00:30 AM