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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 |  |  |  |  |

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