Accumulated Other Comprehensive Income (Loss) (Changes In and Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2023	May 31, 2022
Statement [Line Items]
Total amortization reclassifications recognized in net pension expense	$ 129	$ 636
Tax expense	(31)	(155)
Amortization reclassifications recognized in net pension expense, net of tax	98	481
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	98	481
Changes in fair value	(36,007)	70,042
Tax benefit (expense)	8,871	(17,987)
Changes in fair value, net of tax	(27,136)	52,055
Reclassifications to CarMax Auto Finance income	(12,564)	(299)
Tax benefit	3,063	77
Reclassification of hedge gains, net of tax	(9,501)	(222)
Net change in cash flow hedge unrecognized losses, net of tax	(36,637)	51,833
Total other comprehensive (loss) income, net of tax	(36,539)	52,314
Cost of sales
Statement [Line Items]
Total amortization reclassifications recognized in net pension expense	58	265
CarMax Auto Finance income
Statement [Line Items]
Total amortization reclassifications recognized in net pension expense	4	16
Selling, general and administrative expenses
Statement [Line Items]
Total amortization reclassifications recognized in net pension expense	$ 67	$ 355