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, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Total amortization reclassifications recognized in net pension expense	$ 637	$ 869	$ 1,909	$ 2,605
Tax expense	(155)	(210)	(465)	(629)
Amortization reclassifications recognized in net pension expense, net of tax	482	659	1,444	1,976
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	482	659	1,444	1,976
Changes in fair value	42,521	11,339	152,731	8,668
Tax expense	(10,919)	(2,985)	(39,221)	(2,282)
Changes in fair value, net of tax	31,602	8,354	113,510	6,386
Reclassifications to CarMax Auto Finance income	(8,965)	4,111	(14,951)	13,610
Tax benefit (expense)	2,302	(1,082)	3,839	(3,582)
Reclassification of hedge (gains) losses, net of tax	(6,663)	3,029	(11,112)	10,028
Net change in cash flow hedge unrecognized losses, net of tax	24,939	11,383	102,398	16,414
Total other comprehensive income, net of tax	25,421	12,042	103,842	18,390
Cost of sales
Total amortization reclassifications recognized in net pension expense	272	367	810	1,083
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	19	21	51	64
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 346	$ 481	$ 1,048	$ 1,458