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Auto Loans Held for Investment (Allowance for Loan Losses) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2025 | May 31, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 474,222,000 | $ 493,100,000 | $ 458,730,000 | $ 482,800,000
Financing Receivable, Allowance for Credit Loss, Writeoff | (141,700,000) | (133,100,000) | $ (589,200,000) |
Financing Receivable, Allowance for Credit Loss, Recovery | 55,500,000 | 62,200,000 |  |
Provision for Loan, Lease, and Other Losses | 101,707,000 | $ 81,226,000 |  |
Item As Percent Of Total Ending Managed Receivables, Period Increase (Decrease) | 15 |  |  |
Transfer of auto loans held for sale |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | (26,500,000) |  |  |
Auto loans held for investment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | $ 128,200,000 |  |  |
Allowance For Loan Losses, percent |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Item as percent of total ending managed receivables | 2.76% | 2.79% | 2.61% | 2.78%
Tier 1 |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 395,800,000 | $ 396,600,000 | $ 378,100,000 | $ 389,700,000
Financing Receivable, Allowance for Credit Loss, Writeoff | (120,200,000) | (113,000,000.0) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 48,800,000 | 53,900,000 |  |
Provision for Loan, Lease, and Other Losses |  | 66,000,000.0 |  |
Tier 1 | Transfer of auto loans held for sale |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | (19,100,000) |  |  |
Tier 1 | Auto loans held for investment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | 108,200,000 |  |  |
Tier 2 & Tier 3 |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 78,400,000 | 96,500,000 | $ 80,600,000 | $ 93,100,000
Financing Receivable, Allowance for Credit Loss, Writeoff | (21,500,000) | (20,100,000) |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 6,700,000 | 8,300,000 |  |
Provision for Loan, Lease, and Other Losses |  | $ 15,200,000 |  |
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 | (7,400,000) |  |  |
Tier 2 & Tier 3 | Auto loans held for investment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Provision for Loan, Lease, and Other Losses | $ 20,000,000.0 |  |  |

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