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Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Actuarial loss amortization reclassifications in net pension expense $ 340 $ 429 $ 680 $ 837
Tax expense (127) (159) (254) (311)
Amortization reclassifications recognized in net pension expense, net of tax 213 270 426 526
Net change in retirement benefit plan unrecognized actuarial losses, net of tax 213 270 426 526
Effective portion of changes in fair value (271) 2,890 (2,069) 3,352
Tax (expense) benefit 107 (1,139) 814 (1,320)
Effective portion of changes in fair value, net of tax (164) 1,751 (1,255) 2,032
Reclassifications to CarMax Auto Finance income 2,076 2,605 4,339 5,510
Tax expense (816) (1,025) (1,706) (2,169)
Reclassifications to CarMax Auto Finance income, net of tax 1,260 1,580 2,633 3,341
Net change in cash flow hedge unrecognzied losses, net of tax 1,096 3,331 1,378 5,373
Other comprehensive income (loss), net of taxes 1,309 3,601 1,804 5,899
Cost Of Sales [Member]
        
Actuarial loss amortization reclassifications in net pension expense 138 172 276 334
Carmax Auto Finance [Member]
        
Actuarial loss amortization reclassifications in net pension expense 8 10 15 19
Selling, General And Administrative Expenses [Member]
        
Actuarial loss amortization reclassifications in net pension expense $ 194 $ 247 $ 389 $ 484