v3.26.3
Fair Value Disclosures - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Aug. 31, 2026
Aug. 31, 2025
Nov. 30, 2025
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 $ 101,700,000 $ 64,400,000 $ 171,400,000 $ 99,500,000  
Transfers of assets from Level 3 to Level 2 34,800,000 94,500,000 150,400,000 123,500,000  
Transfers of liabilities from Level 2 to Level 3 34,000,000.0 16,000,000.0 46,300,000 21,300,000  
Transfers of liabilities from Level 3 to Level 2 64,900,000 22,200,000 101,700,000 42,100,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (18,700,000) 30,000,000.0 (52,400,000) 25,100,000  
Total losses (realized and unrealized) 41,900,000 65,500,000 8,600,000 6,400,000  
Value of asset excluded from significant unobservable inputs 36,000,000.0   36,000,000.0   $ 28,200,000
Value of liability excluded from significant unobservable inputs 2,200,000   2,200,000   200,000
Equity securities without readily determinable fair value 21,900,000   21,900,000   $ 21,900,000
Impairment 0 0 0 0  
Investments at fair value          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 74,400,000   74,400,000    
Transfers of assets from Level 3 to Level 2       10,000,000.0  
Collateralized debt obligations and collateralized loan obligations          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 14,100,000 12,600,000 31,700,000 18,600,000  
Transfers of assets from Level 3 to Level 2 13,900,000 27,100,000 52,400,000 35,400,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (3,446,000) (3,654,000) (15,862,000) (14,474,000)  
Loans and other receivables          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 8,600,000 43,500,000 8,400,000 38,200,000  
Transfers of assets from Level 3 to Level 2   4,300,000 50,900,000 20,300,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 1,043,000 3,213,000 25,149,000 (8,455,000)  
Other ABS          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 4,000,000.0 6,700,000 56,300,000 10,000,000.0  
Transfers of assets from Level 3 to Level 2 14,800,000 50,700,000 36,300,000 4,400,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (14,482,000) (2,589,000) (82,710,000) (2,792,000)  
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 5,700,000   5,500,000 50,800,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (9,752,000) 21,824,000 8,953,000 31,303,000  
Total losses (realized and unrealized) (234,000) (312,000) (3,074,000) (864,000)  
Structured Notes          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 2 to Level 3 19,700,000 13,100,000 46,200,000 7,400,000  
Transfers of liabilities from Level 3 to Level 2 56,800,000 14,500,000 62,900,000 32,800,000  
Net derivatives          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 2 to Level 3 13,800,000 2,400,000   13,400,000  
Transfers of liabilities from Level 3 to Level 2 8,000,000.0 7,700,000 29,300,000 9,200,000  
Total losses (realized and unrealized) 59,419,000 9,477,000 56,151,000 (11,263,000)  
Corporate debt securities          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 3 to Level 2   12,300,000 5,200,000 2,500,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 1,520,000 872,000 2,686,000 2,385,000  
Total losses (realized and unrealized) 96,000 126,000 374,000 60,000  
Loans          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 3 to Level 2     7,400,000    
Total losses (realized and unrealized) $ 207,000 $ 1,691,000 $ (1,009,000) $ (14,097,000)