Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Nov. 30, 2022	Aug. 31, 2022	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	Feb. 28, 2021
Non-recourse Notes Payable	$ 16,237,419		$ 15,466,799
Financing Receivable, before Allowance for Credit Loss	16,652,700		15,652,300
Interest Receivable	83,300		67,300
Other	(4,200)		3,100
Financing Receivable, Allowance for Credit Loss	491,047	$ 477,500	433,030	$ 426,500	$ 398,100	$ 411,100
Financing Receivable, after Allowance for Credit Loss	16,240,832		15,289,701
Asset-backed term funding
Financing Receivable, before Allowance for Credit Loss	12,342,000		11,653,800
Warehouse facilities
Financing Receivable, before Allowance for Credit Loss	3,420,900		3,291,900
Overcollateralization
Financing Receivable, before Allowance for Credit Loss	688,100		489,100
Other managed receivables
Financing Receivable, before Allowance for Credit Loss	$ 201,700		$ 217,500