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Component: (Network and Table)
Network
2410406 - Disclosure - Benefit Plans (Assumptions Used To Determine Net Pension Expense) (Details)
(http://www.carmax.com/role/BenefitPlansAssumptionsUsedToDetermineNetPensionExpenseDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001170010 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2015-03-01 - 2016-02-29
2014-03-01 - 2015-02-28
2013-03-01 - 2014-02-28
Scenario [Axis]Scenario [Axis]Scenario [Axis]
Post2004 Lump Sum Payment AssumptionScenario, Unspecified [Domain]Post2004 Lump Sum Payment AssumptionScenario, Unspecified [Domain]Post2004 Lump Sum Payment AssumptionScenario, Unspecified [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Restoration PlanPension PlanRestoration PlanRestoration PlanPension PlanRestoration PlanRestoration PlanPension PlanRestoration Plan
Discount rate (1)
 
.0400  
.0400  
 
.0455  
.0455  
 
.0430  
.0430  
Expected rate of return on plan assets
 
.0775  
.0000  
 
.0775  
.0000  
 
.0775  
.0000  
Discount rate (1)
.0450  
.0450  
.0450  
.0450  
.0400  
.0400  
.0450