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Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Aug. 31, 2024	May 31, 2024	Feb. 29, 2024	Aug. 31, 2023	May 31, 2023	Feb. 28, 2023
Non-recourse Notes Payable	$ 17,095,229		$ 16,866,972
Financing Receivable, before Allowance for Credit Loss	17,769,400		17,391,800
Interest Receivable	103,600		90,900
Other	41,400		11,900
Financing Receivable, Allowance for Credit Loss	500,834	$ 493,100	482,790	$ 538,000	$ 535,400	$ 507,200
Financing Receivable, after Allowance for Credit Loss	17,413,589		17,011,844
Asset-backed term funding
Financing Receivable, before Allowance for Credit Loss	12,801,500		12,638,200
Warehouse facilities
Financing Receivable, before Allowance for Credit Loss	3,743,600		3,744,600
Overcollateralization
Financing Receivable, before Allowance for Credit Loss	775,900		790,900
Other managed receivables
Financing Receivable, before Allowance for Credit Loss	$ 448,400		$ 218,100

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