v2.4.0.8
Comprehensive Income (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, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Total amortization reclassifications recognized in net pension expense $ 429 $ 300 $ 837 $ 600
Tax expense (159) (111) (311) (151)
Amortization reclassifications recognized in net pension expense, net of tax 270 189 526 449
Net change in retirement benefit plan unrecognized actuarial losses, net of tax 270 189 526 449
Effective portion of changes in fair value 2,890 (3,380) 3,352 (6,392)
Tax (expense) benefit (1,139) 9,845 (1,320) 11,026
Effective portion of changes in fair value, net of tax 1,751 6,465 2,032 4,634
Reclassifications to CarMax Auto Finance income 2,605 3,293 5,510 6,528
Tax expense (1,025) (2,563) (2,169) (2,563)
Reclassifications to CarMax Auto Finance income, net of tax 1,580 730 3,341 3,965
Net change in cash flow hedge unrecognzied losses, net of tax 3,331 7,195 5,373 8,599
Other comprehensive income, net of taxes 3,601 7,384 5,899 9,048
Cost Of Sales [Member]
        
Total amortization reclassifications recognized in net pension expense 172 119 334 237
Carmax Auto Finance [Member]
        
Total amortization reclassifications recognized in net pension expense 10 8 19 15
Selling, General And Administrative Expenses [Member]
        
Total amortization reclassifications recognized in net pension expense $ 247 $ 173 $ 484 $ 348