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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 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Total amortization reclassifications recognized in net pension expense $ 453 $ 386 $ 907 $ 773
Tax expense (178) (138) (358) (276)
Amortization reclassifications recognized in net pension expense, net of tax 275 248 549 497
Net change in retirement benefit plan unrecognized actuarial losses, net of tax 275 248 549 497
Effective portion of changes in fair value (3,712) (3,129) (7,938) (798)
Tax benefit 1,461 1,231 3,125 315
Effective portion of changes in fair value, net of tax (2,251) (1,898) (4,813) (483)
Reclassifications to CarMax Auto Finance income 952 3,120 1,965 5,933
Tax expense (374) (1,227) (773) (2,333)
Reclassification of hedge losses, net of tax 578 1,893 1,192 3,600
Net change in cash flow hedge unrecognized losses, net of tax (1,673) (5) (3,621) 3,117
Other comprehensive income (loss), net of taxes (1,398) 243 (3,072) 3,614
Cost of sales        
Total amortization reclassifications recognized in net pension expense 187 160 372 317
CarMax Auto Finance income        
Total amortization reclassifications recognized in net pension expense 11 9 22 18
Selling, general and administrative expenses        
Total amortization reclassifications recognized in net pension expense $ 255 $ 217 $ 513 $ 438