Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Aug. 31, 2022	May 31, 2022	Feb. 28, 2022	Aug. 31, 2021	May 31, 2021	Feb. 28, 2021
Non-recourse Notes Payable	$ 16,121,244		$ 15,466,799
Financing Receivable, before Allowance for Credit Loss	16,349,300		15,652,300
Interest Receivable	81,700		67,300
Other	7,700		3,100
Financing Receivable, Allowance for Credit Loss	477,543	$ 458,200	433,030	$ 398,100	$ 379,500	$ 411,100
Financing Receivable, after Allowance for Credit Loss	15,961,213		15,289,701
Asset-backed term funding
Financing Receivable, before Allowance for Credit Loss	12,563,500		11,653,800
Warehouse facilities
Financing Receivable, before Allowance for Credit Loss	2,997,900		3,291,900
Overcollateralization
Financing Receivable, before Allowance for Credit Loss	629,000		489,100
Other managed receivables
Financing Receivable, before Allowance for Credit Loss	$ 158,900		$ 217,500