Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Amortization recognized in net pension expense, tax	$ 111	$ 14	$ 151	$ 72
Effective portion of changes in fair value, tax	(9,845)	(4,218)	11,026	(6,506)
Reclassifications to CarMax Auto Finance income, tax	2,563	0	2,563	0
Tax Provision Benefit Adjustment, Prior Year [Member]
Deferred Tax Provision (Benefit) Adjustment	8,518		8,518
Tax Provision Benefit Adjustment, Interim Period [Member]
Deferred Tax Provision (Benefit) Adjustment	$ 1,270		$ 1,270