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Network
2402413 - Disclosure - Significant Accounting Policies - Changes of Accumulated Other Comprehensive Income Loss Items, net of tax (Details)
(http://www.acuitybrands.com/role/SignificantAccountingPoliciesChangesOfAccumulatedOtherComprehensiveIncomeLossItemsNetOfTaxDetails)
TableAccumulated Other Comprehensive Income (Loss) [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001144215 (http://www.sec.gov/CIK)
Accumulated Other Comprehensive Income (Loss) [Line Items]Period [Axis]
2015-09-01 - 2016-08-31
Statement, Equity Components [Axis]
Foreign Currency ItemsDefined Benefit Pension PlansEquity Component [Domain]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
 
 
 
Balance at August 31, 2015
(42,100,000) 
(68,300,000) 
(110,400,000) 
Other comprehensive loss before reclassifications
(5,600,000) 
(28,700,000) 
(34,300,000) 
Amounts reclassified from accumulated other comprehensive income
0  
5,300,000  
5,300,000  
Net current-period other comprehensive loss
(5,600,000) 
 
(23,400,000) 
 
(29,000,000) 
 
Balance at August 31, 2016
(47,700,000) 
 
(91,700,000) 
 
(139,400,000)