v3.26.1
Fair Value Disclosures - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Nov. 30, 2025
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 $ 20,300,000 $ 31,500,000 $ 80,800,000 $ 71,800,000  
Transfers of assets from Level 3 to Level 2 71,600,000 43,000,000.0 117,200,000 129,000,000.0  
Transfers of liabilities from Level 2 to Level 3 40,300,000 11,500,000 36,100,000 7,900,000  
Transfers of liabilities from Level 3 to Level 2 30,000,000.0 11,200,000 47,600,000 44,400,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 14,500,000 12,800,000 (31,500,000) 2,500,000  
Total losses (realized and unrealized) (3,600,000) 32,900,000 (23,900,000) (36,300,000)  
Value of asset excluded from significant unobservable inputs 21,400,000   21,400,000   $ 28,200,000
Value of liability excluded from significant unobservable inputs 2,100,000   2,100,000   200,000
Equity securities without readily determinable fair value 21,900,000   21,900,000   $ 21,900,000
Impairment     0 0  
Loans and other receivables          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 7,100,000 1,600,000 3,300,000 27,100,000  
Transfers of assets from Level 3 to Level 2 10,000,000.0 21,500,000 50,900,000 54,100,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 18,797,000 (7,236,000) 22,225,000 (5,759,000)  
Collateralized debt obligations and collateralized loan obligations          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 5,000,000.0   17,000,000.0 3,000,000.0  
Transfers of assets from Level 3 to Level 2 32,900,000 8,000,000.0 38,500,000 8,400,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (4,425,000) (4,123,000) (9,155,000) (10,286,000)  
Other ABS          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 3,900,000 2,100,000 52,300,000 3,300,000  
Transfers of assets from Level 3 to Level 2 27,700,000 2,000,000.0 21,600,000 4,400,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (22,349,000) 6,814,000 (67,663,000) (264,000)  
Corporate debt securities          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3   15,900,000 8,100,000 8,000,000.0  
Transfers of assets from Level 3 to Level 2     5,200,000    
Net gains (losses) on Level 3 assets (realized and unrealized) (184,000) 2,547,000 1,110,000 2,147,000  
Total losses (realized and unrealized) 0 222,000 181,000 52,000  
Structured Notes          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 2 to Level 3 31,300,000 13,200,000 26,400,000 3,900,000  
Transfers of liabilities from Level 3 to Level 2 8,300,000 5,100,000 6,100,000 28,800,000  
Net derivatives          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 2 to Level 3 9,000,000.0 2,000,000.0 9,600,000 3,900,000  
Transfers of liabilities from Level 3 to Level 2 21,500,000 5,700,000 29,600,000    
Total losses (realized and unrealized) 2,873,000 (1,132,000) 2,518,000 (13,925,000)  
Corporate equity securities          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 2 to Level 3 4,300,000 11,100,000   30,300,000  
Transfers of assets from Level 3 to Level 2       50,700,000  
Net gains (losses) on Level 3 assets (realized and unrealized) 24,352,000 8,245,000 19,100,000 9,940,000  
Total losses (realized and unrealized) 2,000 (256,000) 14,000 126,000  
Investments at fair value          
Gain (Loss) on Securities [Line Items]          
Transfers of assets from Level 3 to Level 2   10,000,000.0   10,000,000.0  
Loans          
Gain (Loss) on Securities [Line Items]          
Transfers of liabilities from Level 3 to Level 2     8,500,000 14,500,000  
Total losses (realized and unrealized) $ 135,000 $ (658,000) $ (345,000) $ (1,673,000)