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, 2025	Aug. 31, 2024	Aug. 31, 2025	Aug. 31, 2024
Total amortization reclassifications recognized in net pension expense	$ 99	$ 110	$ 199	$ 221
Tax expense	(23)	(25)	(47)	(52)
Amortization reclassifications recognized in net pension expense, net of tax	76	85	152	169
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	76	85	(152)	(169)
Changes in fair value	(8,117)	55,748	12,711	38,239
Tax benefit	1,971	(13,639)	(3,086)	(9,411)
Changes in fair value, net of tax	(6,146)	42,109	9,625	28,828
Reclassifications to CarMax Auto Finance income	(9,231)	(14,010)	(19,695)	(28,508)
Tax benefit	2,241	3,413	4,782	6,945
Reclassification of hedge gains, net of tax	(6,990)	(10,597)	14,913	21,563
Net change in cash flow hedge unrecognized gains, net of tax	(13,136)	(52,706)	(24,538)	(50,391)
Total other comprehensive loss, net of tax	(13,060)	(52,621)	(24,386)	(50,222)
Cost of sales
Total amortization reclassifications recognized in net pension expense	43	49	87	99
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	3	3	7	7
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 53	$ 58	$ 105	$ 115