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, 2024	May 31, 2023
Total amortization reclassifications recognized in net pension expense	$ 111	$ 129
Tax expense	(27)	(31)
Amortization reclassifications recognized in net pension expense, net of tax	84	98
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	84	98
Changes in fair value	17,509	(36,007)
Tax (expense) benefit	(4,228)	8,871
Changes in fair value, net of tax	13,281	(27,136)
Reclassifications to CarMax Auto Finance income	(14,498)	(12,564)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	3,532	3,063
Reclassification of hedge gains, net of tax	(10,966)	(9,501)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	2,315	(36,637)
Total other comprehensive income (loss), net of tax	2,399	(36,539)
Cost of sales
Total amortization reclassifications recognized in net pension expense	50	58
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	4	4
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 57	$ 67