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, 2023	Aug. 31, 2022	Aug. 31, 2023	Aug. 31, 2022
Total amortization reclassifications recognized in net pension expense	$ 129	$ 636	$ 258	$ 1,272
Tax expense	(31)	(155)	(62)	(310)
Amortization reclassifications recognized in net pension expense, net of tax	98	481	196	962
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	98	481	196	962
Changes in fair value	35,002	40,168	(1,005)	110,210
Tax (expense) benefit	(8,535)	(10,315)	336	(28,302)
Changes in fair value, net of tax	26,467	29,853	(669)	81,908
Reclassifications to CarMax Auto Finance income	(12,295)	(5,687)	(24,859)	(5,986)
Tax benefit	2,997	1,460	6,060	1,537
Reclassification of hedge gains, net of tax	(9,298)	(4,227)	(18,799)	(4,449)
Net change in cash flow hedge unrecognized losses, net of tax	17,169	25,626	(19,468)	77,459
Total other comprehensive income (loss), net of tax	17,267	26,107	(19,272)	78,421
Cost of sales
Total amortization reclassifications recognized in net pension expense	58	273	116	538
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	3	16	7	32
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 68	$ 347	$ 135	$ 702