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Auto Loans Held for Investment (Allowance for Loan Losses) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Feb. 28, 2025
Aug. 31, 2025
Aug. 31, 2024
Feb. 29, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]                
Financing Receivable, Allowance for Credit Loss $ 474,824,000 $ 478,900,000 $ 474,824,000 $ 478,900,000 $ 458,730,000 $ 507,300,000 $ 500,800,000 $ 482,800,000
Financing Receivable, Allowance for Credit Loss, Writeoff (169,800,000) (150,200,000) (480,200,000) (447,100,000) $ (589,200,000)      
Financing Receivable, Allowance for Credit Loss, Recovery 63,900,000 55,700,000 179,000,000.0 176,800,000        
Provision for Loan, Lease, and Other Losses 73,400,000 72,600,000 317,335,000 266,406,000        
Item As Percent Of Total Ending Managed Receivables, Period Increase (Decrease)     26          
Revenue from Contract with Customer, Excluding Assessed Tax $ 5,793,900,000 $ 6,223,400,000 19,935,200,000 $ 20,350,300,000        
Transfer of auto loans held for sale                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Loan, Lease, and Other Losses     (42,200,000)          
Auto loans held for investment                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Loan, Lease, and Other Losses     $ 359,500,000          
Allowance For Loan Losses, percent                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Item as percent of total ending managed receivables 2.87% 2.70% 2.87% 2.70% 2.61% 3.02% 2.82% 2.78%
Tier 1                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Financing Receivable, Allowance for Credit Loss $ 394,900,000 $ 398,700,000 $ 394,900,000 $ 398,700,000 $ 378,100,000 $ 423,200,000 $ 417,300,000 $ 389,700,000
Financing Receivable, Allowance for Credit Loss, Writeoff (145,500,000) (129,000,000.0) (407,000,000.0) (373,100,000)        
Financing Receivable, Allowance for Credit Loss, Recovery 55,200,000 48,700,000 155,400,000 154,700,000        
Provision for Loan, Lease, and Other Losses 62,000,000.0 61,700,000   227,400,000        
Tier 1 | Transfer of auto loans held for sale                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Loan, Lease, and Other Losses     (30,300,000)          
Tier 1 | Auto loans held for investment                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Loan, Lease, and Other Losses     298,700,000          
Tier 2 & Tier 3                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Financing Receivable, Allowance for Credit Loss 79,900,000 80,200,000 79,900,000 80,200,000 $ 80,600,000 $ 84,100,000 $ 83,500,000 $ 93,100,000
Financing Receivable, Allowance for Credit Loss, Writeoff (24,300,000) (21,200,000) (73,200,000) (74,000,000.0)        
Financing Receivable, Allowance for Credit Loss, Recovery 8,700,000 7,000,000.0 23,600,000 22,100,000        
Provision for Loan, Lease, and Other Losses $ 11,400,000 $ 10,900,000   $ 39,000,000.0        
Tier 2 & Tier 3 | Transfer of auto loans held for sale                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Loan, Lease, and Other Losses     (11,900,000)          
Tier 2 & Tier 3 | Auto loans held for investment                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Provision for Loan, Lease, and Other Losses     $ 60,800,000