Accumulated Other Comprehensive Income (Loss) (Changes In and Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022
Total amortization reclassifications recognized in net pension expense	$ 129	$ 637	$ 387	$ 1,909
Tax expense	(31)	(155)	(93)	(465)
Amortization reclassifications recognized in net pension expense, net of tax	98	482	294	1,444
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	98	482	294	1,444
Changes in fair value	(10,594)	42,521	(11,599)	152,731
Tax benefit (expense)	2,640	(10,919)	2,976	(39,221)
Changes in fair value, net of tax	(7,954)	31,602	(8,623)	113,510
Reclassifications to CarMax Auto Finance income	(13,321)	(8,965)	(38,180)	(14,951)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	3,247	2,302	9,307	3,839
Reclassification of hedge gains, net of tax	(10,074)	(6,663)	(28,873)	(11,112)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(18,028)	24,939	(37,496)	102,398
Total other comprehensive (loss) income, net of tax	(17,930)	25,421	(37,202)	103,842
Cost of sales
Total amortization reclassifications recognized in net pension expense	58	272	174	810
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	4	19	11	51
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 67	$ 346	$ 202	$ 1,048