Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
May 31, 2014
May 31, 2013
Actuarial loss amortization reclassifications in net pension expense $ 340 $ 408
Tax expense (127) (152)
Amortization reclassifications recognized in net pension expense, net of tax 213 256
Net change in retirement benefit plan unrecognized actuarial losses, net of tax 213 256
Effective portion of changes in fair value (1,798) 462
Tax (expense) benefit 707 (181)
Effective portion of changes in fair value, net of tax (1,091) 281
Reclassifications to CarMax Auto Finance income 2,263 2,905
Tax expense (890) (1,144)
Reclassifications to CarMax Auto Finance income, net of tax 1,373 1,761
Net change in cash flow hedge unrecognzied losses, net of tax 282 2,042
Other comprehensive income (loss), net of taxes 495 2,298
Cost Of Sales [Member]
   
Actuarial loss amortization reclassifications in net pension expense 138 162
Carmax Auto Finance [Member]
   
Actuarial loss amortization reclassifications in net pension expense 7 9
Selling, General And Administrative Expenses [Member]
   
Actuarial loss amortization reclassifications in net pension expense $ 195 $ 237