v3.26.3
Auto Loans Held for Investment (Past Due Receivables) (Details) - USD ($)
$ in Millions
Aug. 31, 2026
Feb. 28, 2026
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current $ 15,372.7 $ 15,441.1
Past due receivables as a percentage of total auto loans held for investment 5.10% 5.11%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 826.0 $ 830.8
Financing Receivable, before Allowance for Credit Loss $ 16,198.7 $ 16,271.9
Item As A Percent Of Total Auto Loans Held for Investment 100.00% 100.00%
One to Thirty Days Past Due    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 94.90% 94.89%
Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 2.90% 2.96%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 470.2 $ 481.8
Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 1.80% 1.74%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 291.8 $ 282.7
Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Past due receivables as a percentage of total auto loans held for investment 0.40% 0.41%
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 64.0 $ 66.3
Tier 1    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 14,747.5 15,005.4
Financing Receivable, before Allowance for Credit Loss, Noncurrent 685.6 716.1
Financing Receivable, before Allowance for Credit Loss 15,433.1 15,721.5
Tier 1 | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 394.0 419.3
Tier 1 | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 239.0 238.8
Tier 1 | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 52.6 58.0
Tier 1 | Credit Grade A    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 9,581.4 9,414.1
Financing Receivable, before Allowance for Credit Loss, Noncurrent 59.0 59.8
Financing Receivable, before Allowance for Credit Loss 9,640.4 9,473.9
Tier 1 | Credit Grade A | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 36.3 38.3
Tier 1 | Credit Grade A | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 16.9 15.5
Tier 1 | Credit Grade A | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 5.8 6.0
Tier 1 | Credit Grade B    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 4,331.7 4,614.4
Financing Receivable, before Allowance for Credit Loss, Noncurrent 425.5 442.4
Financing Receivable, before Allowance for Credit Loss 4,757.2 5,056.8
Tier 1 | Credit Grade B | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 249.2 264.8
Tier 1 | Credit Grade B | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 144.4 142.1
Tier 1 | Credit Grade B | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 31.9 35.5
Tier 1 | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 834.4 976.9
Financing Receivable, before Allowance for Credit Loss, Noncurrent 201.1 213.9
Financing Receivable, before Allowance for Credit Loss 1,035.5 1,190.8
Tier 1 | Credit Grade C And Other | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 108.5 116.2
Tier 1 | Credit Grade C And Other | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 77.7 81.2
Tier 1 | Credit Grade C And Other | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 14.9 16.5
Tier 2 & Tier 3 | Credit Grade C And Other    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Current 625.2 435.7
Financing Receivable, before Allowance for Credit Loss, Noncurrent 140.4 114.7
Financing Receivable, before Allowance for Credit Loss 765.6 550.4
Tier 2 & Tier 3 | Credit Grade C And Other | Thirty One To Sixty Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 76.2 62.5
Tier 2 & Tier 3 | Credit Grade C And Other | Sixty One To Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent 52.8 43.9
Tier 2 & Tier 3 | Credit Grade C And Other | Greater Than Ninety Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss, Noncurrent $ 11.4 $ 8.3