Accumulated Other Comprehensive Loss (Changes In and Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2020	May 31, 2019
Total amortization reclassifications recognized in net pension expense	$ 959	$ 468
Tax expense	(231)	(113)
Amortization reclassifications recognized in net pension expense, net of tax	728	355
Net change in retirement benefit plan unrecognized actuarial losses, net of tax	728	355
Changes in fair value	(24,862)	(17,942)
Tax benefit	6,575	4,742
Changes in fair value, net of tax	(18,287)	(13,200)
Reclassifications to CarMax Auto Finance income	3,025	(477)
Tax (expense) benefit	(800)	126
Reclassification of hedge losses (gains), net of tax	2,225	(351)
Net change in cash flow hedge unrecognized losses, net of tax	(16,062)	(13,551)
Total other comprehensive income loss, net of tax	(15,334)	(13,196)
Cost of sales
Total amortization reclassifications recognized in net pension expense	373	197
CarMax Auto Finance income
Total amortization reclassifications recognized in net pension expense	31	12
Selling, general and administrative expenses
Total amortization reclassifications recognized in net pension expense	$ 555	$ 259