Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Nov. 30, 2021	Aug. 31, 2021	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	Mar. 01, 2020	Feb. 29, 2020
Total ending managed receivables	$ 15,524,000		$ 13,847,200
Accrued interest and fees	73,700		57,400
Other	(4,000)		(3,700)
Less: allowance for loan losses	(426,507)	$ (398,100)	(411,150)	$ (431,600)	$ (432,500)	$ (359,800)	$ (157,800)
Auto loans receivable, net	15,167,170		13,489,819
Asset-backed term funding
Total ending managed receivables	11,725,400		11,008,300
Warehouse facilities
Total ending managed receivables	3,155,900		2,314,100
Overcollateralization
Total ending managed receivables	479,200		345,200
Other managed receivables
Total ending managed receivables	$ 163,500		$ 179,600