Auto Loans Held for Investment, Net (Details) - USD ($) $ in Thousands	Aug. 31, 2025	May 31, 2025	Feb. 28, 2025	Aug. 31, 2024	May 31, 2024	Feb. 29, 2024
Non-recourse Notes Payable	$ 17,056,916		$ 17,119,758
Financing Receivable, before Allowance for Credit Loss	16,779,700		17,594,600
Interest Receivable	101,500		96,100
Other	12,300		10,800
Financing Receivable, Allowance for Credit Loss	507,286	$ 474,200	458,730	$ 500,800	$ 493,100	$ 482,800
Financing Receivable, after Allowance for Credit Loss	$ 16,386,236		$ 17,242,789