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, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Total amortization reclassifications recognized in net pension expense	$ 111	$ 129	$ 332	$ 387
Tax expense	(27)	(31)	(79)	(93)
Amortization reclassifications recognized in net pension expense, net of tax	84	98	253	294
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	84	98	253	294
Changes in fair value	19,812	(10,594)	(18,427)	(11,599)
Tax (expense) benefit	(4,780)	2,640	4,631	2,976
Changes in fair value, net of tax	15,032	(7,954)	(13,796)	(8,623)
Reclassifications to CarMax Auto Finance income	(12,357)	(13,321)	(40,865)	(38,180)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	3,011	3,247	9,956	9,307
Reclassification of hedge gains, net of tax	(9,346)	(10,074)	(30,909)	(28,873)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	5,686	(18,028)	(44,705)	(37,496)
Total other comprehensive income (loss), net of tax	5,770	(17,930)	(44,452)	(37,202)
Cost of sales
Total amortization reclassifications recognized in net pension expense	48	58	147	174
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	4	4	11	11
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 59	$ 67	$ 174	$ 202