Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Nov. 30, 2023	Aug. 31, 2023	Feb. 28, 2023	Nov. 30, 2022	Aug. 31, 2022	Feb. 28, 2022
Non-recourse Notes Payable	$ 17,029,405		$ 16,360,092
Financing Receivable, before Allowance for Credit Loss	17,505,100		16,767,900
Interest Receivable	97,900		78,000
Other	(9,200)		(3,100)
Financing Receivable, Allowance for Credit Loss	511,924	$ 538,000	507,201	$ 491,000	$ 477,500	$ 433,000
Financing Receivable, after Allowance for Credit Loss	17,081,891		16,341,791
Asset-backed term funding
Financing Receivable, before Allowance for Credit Loss	12,053,200		12,242,800
Warehouse facilities
Financing Receivable, before Allowance for Credit Loss	4,529,600		3,649,900
Overcollateralization
Financing Receivable, before Allowance for Credit Loss	783,400		739,900
Other managed receivables
Financing Receivable, before Allowance for Credit Loss	$ 138,900		$ 135,300