Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 29, 2020
Actuarial gain (loss) arising during the year	$ 22,517	$ 33,913	$ (68,861)
Tax (expense) benefit	(5,483)	(8,184)	16,607
Actuarial gain (loss) arising during the year, net of tax	17,034	25,729	(52,254)
Actuarial loss amortization reclassifications in net pension expense	3,473	3,837	1,874
Tax expense	(846)	(926)	(444)
Amortization reclassifications recognized in net pension expense, net of tax	2,627	2,911	1,430
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	19,661	28,640	(50,824)
Changes in fair value	54,105	(17,122)	(47,083)
Tax (expense) benefit	(13,894)	4,506	12,452
Changes in fair value, net of tax	40,211	(12,616)	(34,631)
Reclassifications to CarMax Auto Finance income	16,680	20,841	4,614
Tax expense	(4,283)	(5,485)	(1,220)
Reclassification of hedge losses, net of tax	12,397	15,356	3,394
Net change in cash flow hedge unrecognized gains, net of tax	52,608	2,740	(31,237)
Total other comprehensive income (loss), net of tax	72,269	31,380	(82,061)
TOTAL COST OF SALES
Actuarial loss amortization reclassifications in net pension expense	1,451	1,617	797
CarMax Auto Finance income
Actuarial loss amortization reclassifications in net pension expense	84	108	49
Selling, general and administrative expenses
Actuarial loss amortization reclassifications in net pension expense	$ 1,938	$ 2,112	$ 1,028