Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Nov. 30, 2024	Aug. 31, 2024	Feb. 29, 2024	Nov. 30, 2023	Aug. 31, 2023	Feb. 28, 2023
Non-recourse Notes Payable	$ 17,096,313		$ 16,866,972
Financing Receivable, before Allowance for Credit Loss	17,756,400		17,391,800
Interest Receivable	107,100		90,900
Other	28,300		11,900
Financing Receivable, Allowance for Credit Loss	478,923	$ 500,800	482,790	$ 511,900	$ 538,000	$ 507,200
Financing Receivable, after Allowance for Credit Loss	17,412,940		17,011,844
Asset-backed term funding
Financing Receivable, before Allowance for Credit Loss	12,649,000		12,638,200
Warehouse facilities
Financing Receivable, before Allowance for Credit Loss	3,937,600		3,744,600
Overcollateralization
Financing Receivable, before Allowance for Credit Loss	825,400		790,900
Other managed receivables
Financing Receivable, before Allowance for Credit Loss	$ 344,400		$ 218,100