v3.26.1
Auto Loans Held for Investment (Allowance for Loan Losses) (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 31, 2026
May 31, 2025
Feb. 28, 2026
Feb. 28, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss $ 474,986,000 $ 474,200,000 $ 453,027,000 $ 458,700,000
Financing Receivable, Allowance for Credit Loss, Writeoff (133,900,000) (141,700,000) $ (636,100,000)  
Financing Receivable, Allowance for Credit Loss, Recovery 60,300,000 55,500,000    
Provision for Loan, Lease, and Other Losses 95,584,000 101,707,000    
Item As Percent Of Total Ending Managed Receivables, Period Increase (Decrease) 17      
Transfer of auto loans held for sale        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for Loan, Lease, and Other Losses (25,100,000) (26,500,000)    
Auto loans held for investment        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for Loan, Lease, and Other Losses $ 120,700,000 $ 128,200,000    
Allowance For Loan Losses, percent        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Item as percent of total ending managed receivables 2.95% 2.76% 2.78% 2.61%
Tier 1        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss $ 359,800,000 $ 395,800,000 $ 377,700,000 $ 378,100,000
Financing Receivable, Allowance for Credit Loss, Writeoff (115,100,000) (120,200,000)    
Financing Receivable, Allowance for Credit Loss, Recovery 52,800,000 48,800,000    
Provision for Loan, Lease, and Other Losses 68,300,000 108,200,000    
Tier 1 | Transfer of auto loans held for sale        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for Loan, Lease, and Other Losses (23,900,000) (19,100,000)    
Tier 2 & Tier 3        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Financing Receivable, Allowance for Credit Loss 115,200,000 78,400,000 $ 75,300,000 $ 80,600,000
Financing Receivable, Allowance for Credit Loss, Writeoff (18,800,000) (21,500,000)    
Financing Receivable, Allowance for Credit Loss, Recovery 7,500,000 6,700,000    
Provision for Loan, Lease, and Other Losses 52,400,000 20,000,000.0    
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 $ (1,200,000) $ (7,400,000)