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Fair Value Disclosures - Narrative (Details) - USD ($)
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Nov. 30, 2025
Gain (Loss) on Securities [Line Items]      
Transfers of assets from Level 2 to Level 3 $ 81,400,000 $ 52,500,000  
Transfers of assets from Level 3 to Level 2 71,300,000 96,600,000  
Transfers of liabilities from Level 2 to Level 3 10,800,000 22,100,000  
Transfers of liabilities from Level 3 to Level 2 26,000,000.0 53,700,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (53,000,000.0) (5,400,000)  
Total losses (realized and unrealized) (30,200,000) (72,900,000)  
Value of asset excluded from significant unobservable inputs 41,400,000   $ 28,200,000
Value of liability excluded from significant unobservable inputs 1,700,000   200,000
Equity securities without readily determinable fair value 21,900,000   $ 21,900,000
Impairment 0 0  
Other ABS      
Gain (Loss) on Securities [Line Items]      
Transfers of assets from Level 2 to Level 3 48,500,000    
Transfers of assets from Level 3 to Level 2   2,300,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (45,135,000) (1,889,000)  
Corporate debt securities      
Gain (Loss) on Securities [Line Items]      
Transfers of assets from Level 2 to Level 3 17,200,000    
Transfers of assets from Level 3 to Level 2 5,200,000 4,200,000  
Transfers of liabilities from Level 3 to Level 2 3,400,000    
Net gains (losses) on Level 3 assets (realized and unrealized) 1,716,000 (1,002,000)  
Total losses (realized and unrealized) 192,000 (40,000)  
Collateralized debt obligations and collateralized loan obligations      
Gain (Loss) on Securities [Line Items]      
Transfers of assets from Level 2 to Level 3 12,000,000.0 5,700,000  
Transfers of assets from Level 3 to Level 2 11,600,000    
Net gains (losses) on Level 3 assets (realized and unrealized) (7,026,000) (4,646,000)  
Total losses (realized and unrealized) 3,000    
Loans and other receivables      
Gain (Loss) on Securities [Line Items]      
Transfers of assets from Level 2 to Level 3 3,500,000 24,800,000  
Transfers of assets from Level 3 to Level 2 51,100,000 38,700,000  
Net gains (losses) on Level 3 assets (realized and unrealized) (973,000) (949,000)  
Corporate equity securities      
Gain (Loss) on Securities [Line Items]      
Transfers of assets from Level 2 to Level 3   20,500,000  
Transfers of assets from Level 3 to Level 2 3,300,000 51,000,000.0  
Net gains (losses) on Level 3 assets (realized and unrealized) (6,089,000) 2,864,000  
Total losses (realized and unrealized) 12,000 (72,000)  
Structured Notes      
Gain (Loss) on Securities [Line Items]      
Transfers of liabilities from Level 2 to Level 3 9,200,000 8,600,000  
Transfers of liabilities from Level 3 to Level 2 12,600,000 39,100,000  
Net derivatives      
Gain (Loss) on Securities [Line Items]      
Transfers of liabilities from Level 2 to Level 3 1,600,000 13,200,000  
Transfers of liabilities from Level 3 to Level 2 1,200,000    
Total losses (realized and unrealized) (11,191,000) (16,020,000)  
Loans      
Gain (Loss) on Securities [Line Items]      
Transfers of liabilities from Level 3 to Level 2 8,800,000 14,500,000  
Total losses (realized and unrealized) $ (40,000) $ 301,000