Accumulated Other Comprehensive Income (Loss) (Changes In and Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Total amortization reclassifications recognized in net pension expense	$ 636	$ 868	$ 1,272	$ 1,736
Tax expense	(155)	(210)	(310)	(419)
Amortization reclassifications recognized in net pension expense, net of tax	481	658	962	1,317
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	481	658	962	1,317
Changes in fair value	40,168	(665)	110,210	(2,671)
Tax (expense) benefit	(10,315)	175	(28,302)	703
Changes in fair value, net of tax	29,853	(490)	81,908	(1,968)
Reclassifications to CarMax Auto Finance income	(5,687)	4,401	(5,986)	9,499
Tax benefit (expense)	1,460	(1,158)	1,537	(2,500)
Reclassification of hedge (losses) gains, net of tax	(4,227)	3,243	(4,449)	6,999
Net change in cash flow hedge unrecognized losses, net of tax	25,626	2,753	77,459	5,031
Total other comprehensive income, net of tax	26,107	3,411	78,421	6,348
Cost of sales
Total amortization reclassifications recognized in net pension expense	273	359	538	716
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	16	21	32	43
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 347	$ 488	$ 702	$ 977