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Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2024
Assets:        
Total gains/(losses) (realized and unrealized) $ (30,000) $ 7,300 $ (25,100) $ 53,800
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held       0
Liabilities:        
Total gains/(losses) (realized and unrealized) $ 65,500 $ 16,500 $ 6,400 $ 23,300
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues Revenues
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues Revenues
Corporate equity securities        
Assets:        
Beginning balance $ 231,160 $ 178,755 $ 239,364 $ 181,294
Total gains/(losses) (realized and unrealized) (21,824) (9,887) (31,303) 3,969
Purchases (20,785) (12,874) (28,748) (28,576)
Sales (1,487) (1,035) (8,940) (2,480)
Settlements (788) (198) 494 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 815 360 (18,660) (2,778)
Ending balance 272,309 200,643 272,309 200,643
Changes in unrealized gains/(losses) included in earnings for instruments still held 21,916 10,184 29,840 (3,179)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Liabilities:        
Beginning balance 161 708 208 676
Total gains/(losses) (realized and unrealized) (312) 4 (864) 5
Purchases (1) 0 (72,161) 0
Sales 426 2,264 73,148 2,289
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 522 (6) 465 0
Ending balance 796 2,970 796 2,970
Changes in unrealized gains/ (losses) included in earnings for instruments still held 309 (4) 999 (5)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Corporate debt securities        
Assets:        
Beginning balance 44,682 38,717 24,931 26,112
Total gains/(losses) (realized and unrealized) (872) (93) (2,385) (3,060)
Purchases (1,221) 0 (12,455) (14,894)
Sales (788) (1,753) (1,168) (6,735)
Settlements 0 0 (2,197) (200)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (11,607) (5,879) (2,026) (5,953)
Ending balance 34,380 31,178 34,380 31,178
Changes in unrealized gains/(losses) included in earnings for instruments still held 860 1,181 1,472 7,309
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Liabilities:        
Beginning balance 644 506 165 124
Total gains/(losses) (realized and unrealized) 126 0 60 (23)
Purchases (119) (246) (280) 0
Sales 0 0 351 0
Settlements (270) 0 192 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 107 0 0 159
Ending balance 488 260 488 260
Changes in unrealized gains/ (losses) included in earnings for instruments still held (117) 0 (90) 23
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
CDOs and CLOs        
Assets:        
Beginning balance 70,948 68,626 63,976 64,862
Total gains/(losses) (realized and unrealized) 3,654 (1,477) 14,474 (8,771)
Purchases (20,718) (17,704) (69,479) (41,690)
Sales (17,731) (1,147) (39,811) (22,797)
Settlements (3,463) (1,323) (10,013) (5,214)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (14,509) (3,256) (16,848) (5,231)
Ending balance 52,309 82,081 52,309 82,081
Changes in unrealized gains/(losses) included in earnings for instruments still held (4,188) 649 (15,237) 4,351
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Sovereign obligations        
Assets:        
Beginning balance   0 172 0
Total gains/(losses) (realized and unrealized)   0 (2) 16
Purchases   0 0 (11,147)
Sales   0 (174) (11,025)
Settlements   0 0 0
Issuances   0 0 0
Net transfers into/ (out of) Level 3   106 0 0
Ending balance 0 106 0 106
Changes in unrealized gains/(losses) included in earnings for instruments still held   0 0 3
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held   0 0 0
RMBS        
Assets:        
Beginning balance 7,947 644 7,714 20,871
Total gains/(losses) (realized and unrealized) (46) (24) (315) 185
Purchases 0 0 0 0
Sales 0 0 0 (5,374)
Settlements (15) (12) (51) (63)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 (32) 0 (14,625)
Ending balance 7,978 624 7,978 624
Changes in unrealized gains/(losses) included in earnings for instruments still held 50 34 331 33
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
CMBS        
Assets:        
Beginning balance 505 477 477 508
Total gains/(losses) (realized and unrealized) (1) (15) (29) 16
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 0 0 0
Ending balance 506 492 506 492
Changes in unrealized gains/(losses) included in earnings for instruments still held 1 0 29 (64)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Liabilities:        
Beginning balance 1,153 1,049 1,153 840
Total gains/(losses) (realized and unrealized) 0 0 0 0
Purchases 0 0 0 (245)
Sales 35 0 105 0
Settlements 0 70 0 525
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 0 (70) (1)
Ending balance 1,188 1,119 1,188 1,119
Changes in unrealized gains/ (losses) included in earnings for instruments still held 0 0 0 (2)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Other ABS        
Assets:        
Beginning balance 153,681 168,736 103,214 117,661
Total gains/(losses) (realized and unrealized) 2,589 966 2,792 7,724
Purchases (23,586) (29,502) (60,151) (94,754)
Sales (1,579) (27,528) (31,920) (68,622)
Settlements (2,888) (3,608) (8,089) (19,929)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (44,036) (20,733) 5,611 29,263
Ending balance 126,175 145,403 126,175 145,403
Changes in unrealized gains/(losses) included in earnings for instruments still held (732) (1,988) (1,256) (5,778)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Loans and other receivables        
Assets:        
Beginning balance 92,168 92,546 152,586 130,101
Total gains/(losses) (realized and unrealized) (3,213) 18,742 8,455 43,105
Purchases (65,988) (10,138) (213,419) (20,220)
Sales (44,566) (4,489) (196,921) (4,856)
Settlements (16,129) (2,258) (38,621) (19,523)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 39,248 9,929 17,914 4,287
Ending balance 139,922 87,124 139,922 87,124
Changes in unrealized gains/(losses) included in earnings for instruments still held 4,862 (5,863) 10,777 (17,949)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Investments at fair value        
Assets:        
Beginning balance 153,379 138,057 137,865 130,835
Total gains/(losses) (realized and unrealized) (10,308) (952) (16,742) 10,626
Purchases (1,000) (371) (22,549) (19,725)
Sales (2,446) 0 (2,446) 0
Settlements (741) 0 (3,210) (547)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 0 (10,000) (7)
Ending balance 161,500 139,380 161,500 139,380
Changes in unrealized gains/(losses) included in earnings for instruments still held 9,502 952 13,540 (10,626)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Loans        
Liabilities:        
Beginning balance 313 1,584 16,864 1,521
Total gains/(losses) (realized and unrealized) 1,691 (1,000) (14,097) 1,879
Purchases 0 0 (875) (180)
Sales 0 964 74 1,367
Settlements 0 12 0 152
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (38) 0 0 (3,179)
Ending balance 1,966 1,560 1,966 1,560
Changes in unrealized gains/ (losses) included in earnings for instruments still held (1,101) 1 (1,790) (26)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Net derivatives        
Liabilities:        
Beginning balance 33,288 34,877 22,286 50,955
Total gains/(losses) (realized and unrealized) 9,477 (7,588) (11,263) (17,212)
Purchases (533) 0 (533) (3,236)
Sales 719 0 23,307 2,471
Settlements (748) 734 (1,166) (9,504)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (5,307) 477 4,265 5,026
Ending balance 36,896 28,500 36,896 28,500
Changes in unrealized gains/ (losses) included in earnings for instruments still held (9,313) 4,363 2,447 5,659
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held 0 0 0 0
Other secured financings        
Liabilities:        
Beginning balance 18,876 3,965 14,884 3,898
Total gains/(losses) (realized and unrealized) 143 0 346 4,482
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (2,905) 0 (7,647) (4,415)
Issuances 0 0 8,531 0
Net transfers into/ (out of) Level 3 0 0 0 0
Ending balance 16,114 3,965 16,114 3,965
Changes in unrealized gains/ (losses) included in earnings for instruments still held (255) 0 (1,366) (4,482)
Long-term debt        
Liabilities:        
Beginning balance 991,156 784,212 821,903 744,597
Total gains/(losses) (realized and unrealized) 54,332 25,080 32,255 34,157
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (2,050) 0 (4,849) (2,109)
Issuances 29,155 542 247,279 28,614
Net transfers into/ (out of) Level 3 (1,429) (20,688) (25,424) (16,113)
Ending balance 1,071,164 789,146 1,071,164 789,146
Changes in unrealized gains/ (losses) included in earnings for instruments still held (7,342) (37,145) (28,330) (41,836)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held $ (44,940) $ 12,065 $ (3,925) $ 7,679