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Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Assets:    
Total gains/(losses) (realized and unrealized) $ (53,000) $ (5,400)
Liabilities:    
Total gains/(losses) (realized and unrealized) $ (30,200) $ (72,900)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues
Corporate equity securities    
Assets:    
Beginning balance $ 218,853 $ 239,364
Total gains/(losses) (realized and unrealized) (6,089) 2,864
Purchases 12,452 1,703
Sales (3,342) (1,016)
Settlements (397) 0
Issuances 0 0
Net transfers into/ (out of) Level 3 (2,994) (30,506)
Ending balance 218,483 212,409
Changes in unrealized gains/(losses) included in earnings for instruments still held (6,456) 5,300
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Liabilities:    
Beginning balance 155 208
Total gains/(losses) (realized and unrealized) 12 (72)
Purchases 0 0
Sales 0 454
Settlements 0 0
Issuances 0 0
Net transfers into/ (out of) Level 3 0 0
Ending balance 167 590
Changes in unrealized gains/ (losses) included in earnings for instruments still held (12) 72
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Corporate debt securities    
Assets:    
Beginning balance 37,578 24,931
Total gains/(losses) (realized and unrealized) 1,716 (1,002)
Purchases 66,717 6,753
Sales (66,617) (895)
Settlements (629) 0
Issuances 0 0
Net transfers into/ (out of) Level 3 11,990 (3,862)
Ending balance 50,755 25,925
Changes in unrealized gains/(losses) included in earnings for instruments still held (579) (1,248)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Liabilities:    
Beginning balance 3,720 165
Total gains/(losses) (realized and unrealized) 192 (40)
Purchases 0 (383)
Sales 0 1,025
Settlements 0 0
Issuances 0 0
Net transfers into/ (out of) Level 3 (3,357) 346
Ending balance 555 1,113
Changes in unrealized gains/ (losses) included in earnings for instruments still held (192) 24
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
CDOs and CLOs    
Assets:    
Beginning balance 40,187 63,976
Total gains/(losses) (realized and unrealized) (7,026) (4,646)
Purchases 39,519 17,177
Sales (11,654) (9,981)
Settlements 0 0
Issuances 0 0
Net transfers into/ (out of) Level 3 429 5,301
Ending balance 61,455 71,827
Changes in unrealized gains/(losses) included in earnings for instruments still held (5,505) (4,664)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Liabilities:    
Beginning balance 0  
Total gains/(losses) (realized and unrealized) 3  
Purchases 0  
Sales 0  
Settlements (3)  
Issuances 0  
Net transfers into/ (out of) Level 3 0  
Ending balance 0  
Changes in unrealized gains/ (losses) included in earnings for instruments still held 0  
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0  
Sovereign obligations    
Assets:    
Beginning balance   172
Total gains/(losses) (realized and unrealized)   2
Purchases   0
Sales   (174)
Settlements   0
Issuances  
Net transfers into/ (out of) Level 3  
Ending balance   0
Changes in unrealized gains/(losses) included in earnings for instruments still held   (1)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held   0
RMBS    
Assets:    
Beginning balance 6,663 7,714
Total gains/(losses) (realized and unrealized) (127) (167)
Purchases 0 0
Sales 0 0
Settlements (402) (21)
Issuances 0 0
Net transfers into/ (out of) Level 3 0 0
Ending balance 6,134 7,526
Changes in unrealized gains/(losses) included in earnings for instruments still held (127) (59)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Liabilities:    
Beginning balance   0
Total gains/(losses) (realized and unrealized)   0
Purchases   0
Sales   15
Settlements   0
Issuances   0
Net transfers into/ (out of) Level 3   0
Ending balance   15
Changes in unrealized gains/ (losses) included in earnings for instruments still held   0
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held   0
CMBS    
Assets:    
Beginning balance 348 477
Total gains/(losses) (realized and unrealized) 7 (6)
Purchases 0 0
Sales 0 0
Settlements 0 0
Issuances 0 0
Net transfers into/ (out of) Level 3 0 0
Ending balance 355 471
Changes in unrealized gains/(losses) included in earnings for instruments still held 7 0
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Liabilities:    
Beginning balance   1,153
Total gains/(losses) (realized and unrealized)   1
Purchases   0
Sales   35
Settlements   0
Issuances   0
Net transfers into/ (out of) Level 3   (35)
Ending balance   1,154
Changes in unrealized gains/ (losses) included in earnings for instruments still held   (1)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held   0
Other ABS    
Assets:    
Beginning balance 133,001 103,214
Total gains/(losses) (realized and unrealized) (45,135) (1,889)
Purchases 119,288 54,165
Sales (7,909) (4,709)
Settlements (2,919) (2,312)
Issuances 0 0
Net transfers into/ (out of) Level 3 48,388 (1,150)
Ending balance 244,714 147,319
Changes in unrealized gains/(losses) included in earnings for instruments still held (45,257) (1,318)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Loans and other receivables    
Assets:    
Beginning balance 127,720 152,586
Total gains/(losses) (realized and unrealized) (973) (949)
Purchases 214,243 78,763
Sales (207,158) (53,590)
Settlements (790) (9,170)
Issuances 0 0
Net transfers into/ (out of) Level 3 (47,646) (13,876)
Ending balance 85,396 153,764
Changes in unrealized gains/(losses) included in earnings for instruments still held 2,488 (1,545)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Investments at fair value    
Assets:    
Beginning balance 163,107 137,865
Total gains/(losses) (realized and unrealized) 4,636 393
Purchases 250 21,288
Sales (23) 0
Settlements (775) (1,665)
Issuances 0 0
Net transfers into/ (out of) Level 3 0 0
Ending balance 167,195 157,881
Changes in unrealized gains/(losses) included in earnings for instruments still held 3,895 393
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Loans    
Liabilities:    
Beginning balance 9,757 16,864
Total gains/(losses) (realized and unrealized) (40) 301
Purchases (697) (1,917)
Sales 725 75
Settlements 0 0
Issuances 0 0
Net transfers into/ (out of) Level 3 (8,824) (14,475)
Ending balance 921 848
Changes in unrealized gains/ (losses) included in earnings for instruments still held (1,687) 89
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Net derivatives    
Liabilities:    
Beginning balance 35,642 22,286
Total gains/(losses) (realized and unrealized) (11,191) (16,020)
Purchases (5,332) 0
Sales 0 22,588
Settlements 1,484 (279)
Issuances 7,638 299
Net transfers into/ (out of) Level 3 321 13,202
Ending balance 28,562 42,076
Changes in unrealized gains/ (losses) included in earnings for instruments still held 7,430 14,559
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0
Other secured financings    
Liabilities:    
Beginning balance 13,454 14,884
Total gains/(losses) (realized and unrealized) (144) (1,938)
Purchases 0 0
Sales 120 0
Settlements (1,745) (241)
Issuances 0 0
Net transfers into/ (out of) Level 3 0 0
Ending balance 11,685 12,705
Changes in unrealized gains/ (losses) included in earnings for instruments still held 134 1,938
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held   0
Long-term debt    
Liabilities:    
Beginning balance 1,063,358 821,903
Total gains/(losses) (realized and unrealized) (18,984) (55,177)
Purchases 0 0
Sales 0 0
Settlements (23,695) 0
Issuances 6,737 124,554
Net transfers into/ (out of) Level 3 (3,349) (30,596)
Ending balance 1,024,067 860,684
Changes in unrealized gains/ (losses) included in earnings for instruments still held (34,884) 29,428
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held $ 53,868 $ 25,749