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Fair Value Disclosures - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2025 | Aug. 31, 2024 | Aug. 31, 2025 | Aug. 31, 2024 | Nov. 30, 2024
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 2 to Level 3 | $ 64,400,000 | $ 31,300,000 | $ 99,500,000 | $ 61,000,000.0 |
Transfers of assets from Level 3 to Level 2 | 94,500,000 | 50,800,000 | 123,500,000 | 56,000,000.0 |
Transfers of liabilities from Level 2 to Level 3 | 16,000,000.0 | 18,800,000 | 21,300,000 | 39,400,000 |
Transfers of liabilities from Level 3 to Level 2 | 22,200,000 | 39,000,000.0 | 42,100,000 | 53,100,000 |
Net gains (losses) on Level 3 assets (realized and unrealized) | 30,000,000.0 | (7,300,000) | 25,100,000 | (53,800,000) |
Total gains/(losses) (realized and unrealized) | 65,500,000 | 16,500,000 | 6,400,000 | 23,300,000 |
Value of asset excluded from significant unobservable inputs | 31,400,000 |  | 31,400,000 |  | $ 23,900,000
Value of liability excluded from significant unobservable inputs | 2,500,000 |  | 2,500,000 |  | 2,700,000
Aggregate fair value of loans and other receivables on nonaccrual status and/or 90 days or greater past due | 129,100,000 |  | 129,100,000 |  | 126,900,000
Loan and other receivables greater than 90 days past due | 94,300,000 |  | 94,300,000 |  | 120,000,000.0
Equity securities without readily determinable fair value | 21,900,000 |  | 21,900,000 |  | $ 21,900,000
Impairment | 0 | 0 | 0 | 0 |
Monashee |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Our total equity balance |  | 21,900,000 |  | 21,900,000 |
Corporate debt securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 3 to Level 2 | 12,300,000 | 7,100,000 | 2,500,000 | 7,500,000 |
Net gains (losses) on Level 3 assets (realized and unrealized) | 872,000 | 93,000 | 2,385,000 | 3,060,000 |
Total gains/(losses) (realized and unrealized) | 126,000 | 0 | 60,000 | (23,000) |
Corporate equity securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 2 to Level 3 |  |  | 32,200,000 |  |
Transfers of assets from Level 3 to Level 2 |  |  | 50,800,000 | 3,300,000 |
Net gains (losses) on Level 3 assets (realized and unrealized) | 21,824,000 | 9,887,000 | 31,303,000 | (3,969,000) |
Total gains/(losses) (realized and unrealized) | (312,000) | 4,000 | (864,000) | 5,000 |
Other ABS |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 2 to Level 3 | 6,700,000 | 3,300,000 | 10,000,000.0 | 47,600,000 |
Transfers of assets from Level 3 to Level 2 | 50,700,000 | 24,000,000.0 | 4,400,000 | 18,300,000 |
Net gains (losses) on Level 3 assets (realized and unrealized) | (2,589,000) | (966,000) | (2,792,000) | (7,724,000) |
Loans and other receivables |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 2 to Level 3 | 43,500,000 | 15,900,000 | 38,200,000 | 11,300,000 |
Transfers of assets from Level 3 to Level 2 | 4,300,000 | 5,900,000 | 20,300,000 | 7,000,000.0 |
Net gains (losses) on Level 3 assets (realized and unrealized) | 3,213,000 | (18,742,000) | (8,455,000) | (43,105,000) |
Investments at fair value |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 3 to Level 2 |  |  | 10,000,000 |  |
Collateralized debt obligations and collateralized loan obligations |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 2 to Level 3 | 12,600,000 | 10,100,000 | 18,600,000 |  |
Transfers of assets from Level 3 to Level 2 | 27,100,000 | 13,400,000 | 35,400,000 | 5,200,000 |
Net gains (losses) on Level 3 assets (realized and unrealized) | (3,654,000) | 1,477,000 | (14,474,000) | 8,771,000 |
Structured Notes |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of liabilities from Level 2 to Level 3 | 13,100,000 | 9,600,000 | 7,400,000 | 18,800,000 |
Transfers of liabilities from Level 3 to Level 2 | 14,500,000 | 30,200,000 | 32,800,000 | 34,900,000 |
Net derivatives |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of liabilities from Level 2 to Level 3 | 2,400,000 | 9,300,000 | 13,400,000 | 23,200,000 |
Transfers of liabilities from Level 3 to Level 2 | 7,700,000 | 8,800,000 | 9,200,000 | 18,200,000 |
Total gains/(losses) (realized and unrealized) | 9,477,000 | (7,588,000) | (11,263,000) | (17,212,000) |
Residential mortgage-backed securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Transfers of assets from Level 3 to Level 2 |  |  |  | 14,600,000 |
Net gains (losses) on Level 3 assets (realized and unrealized) | $ 46,000 | $ 24,000 | $ 315,000 | $ (185,000) |

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