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Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Total amortization reclassifications recognized in net pension expense $ 387 $ 514 $ 1,160 $ 1,543
Tax expense (140) (192) (416) (576)
Amortization reclassifications recognized in net pension expense, net of tax 247 322 744 967
Net change in retirement benefit plan unrecognized actuarial losses, net of tax 247 322 744 967
Effective portion of changes in fair value 7,282 (3,325) 6,484 (9,596)
Tax (expense) benefit (2,863) 1,308 (2,548) 3,775
Effective portion of changes in fair value, net of tax 4,419 (2,017) 3,936 (5,821)
Reclassifications to CarMax Auto Finance income 2,935 1,944 8,868 5,902
Tax expense (1,154) (764) (3,487) (2,321)
Reclassification of hedge losses, net of tax 1,781 1,180 5,381 3,581
Net change in cash flow hedge unrecognized losses, net of tax 6,200 (837) 9,317 (2,240)
Other comprehensive income (loss), net of taxes 6,447 (515) 10,061 (1,273)
Cost of sales        
Total amortization reclassifications recognized in net pension expense 160 212 477 628
CarMax Auto Finance income        
Total amortization reclassifications recognized in net pension expense 10 13 28 37
Selling, general and administrative expenses        
Total amortization reclassifications recognized in net pension expense $ 217 $ 289 $ 655 $ 878