CarMax Auto Finance (Components Of CarMax Auto Finance Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2025	May 31, 2024
Auto Finance Income [Line Items]
Interest and fee income	$ 485,400	$ 452,500
Interest expense	(197,500)	(182,300)
Total interest margin	287,900	270,200
Provision for loan losses	(101,707)	(81,226)
Total interest margin after provision for loan losses	186,200	189,000
Payroll and fringe benefit expense	(20,000)	(18,600)
Other Depreciation and Amortization	(4,300)	(4,200)
Other direct expenses	(20,200)	(19,200)
Total direct expenses	(44,500)	(42,000)
CarMax Auto Finance income	$ 141,650	$ 146,970