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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)