Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2021
Assets:        
Total gains/losses (realized and unrealized) $ 39,000 $ 21,800 $ 68,700 $ 35,500
Liabilities:        
Total gains/losses (realized and unrealized) (159,200) 7,000 (332,300) 60,700
Corporate equity securities        
Assets:        
Beginning balance 108,156 83,278 76,082 75,797
Total gains/losses (realized and unrealized) 39,854 12,057 46,237 14,329
Purchases 67,540 448 86,544 8,288
Sales (13,415) (24,561) (13,839) (37,297)
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (2,667) 502 4,444 10,607
Ending balance 199,468 71,724 199,468 71,724
For instruments still held, changes in unrealized gains/(losses) included in Earnings 39,634 (911) 45,978 (653)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Liabilities:        
Beginning Balance 5,666 4,443 4,635 4,434
Total gains/losses (realized and unrealized) (234) 42 (3,592) 64
Purchases (1,533) (23) (2,344) (23)
Sales 0 0 5,050 0
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (150) 0 0 (13)
Ending Balance 3,749 4,462 3,749 4,462
For instruments still held, changes in unrealized gains/(losses) included in Earnings (350) (40) 3,009 (62)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Corporate debt securities        
Assets:        
Beginning balance 42,358 6,811 11,803 23,146
Total gains/losses (realized and unrealized) 3,550 1,292 5,631 2,466
Purchases 38,141 4,116 16,463 4,370
Sales (47,025) (5,870) (18,345) (5,960)
Settlements (12,604) (132) (9) (132)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (3,607) 1,768 5,270 (15,905)
Ending balance 20,813 7,985 20,813 7,985
For instruments still held, changes in unrealized gains/(losses) included in Earnings (849) 963 2,381 1,492
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Liabilities:        
Beginning Balance 7,308 1,571 482 141
Total gains/losses (realized and unrealized) (3,588) (22) (11) 1,349
Purchases (16,091) (665) (70) (563)
Sales 14,584 27 0 0
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (1,812) 16 0 0
Ending Balance 401 927 401 927
For instruments still held, changes in unrealized gains/(losses) included in Earnings 5 (38) 5 (414)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
CDOs and CLOs        
Assets:        
Beginning balance 45,219 25,894 31,944 10,513
Total gains/losses (realized and unrealized) 877 6,557 254 9,695
Purchases 13,264 4,287 31,245 16,510
Sales (28,037) (29,324) (37,305) (27,251)
Settlements (1,466) (1,072) (5,033) (1,142)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 20,001 20,124 28,753 18,141
Ending balance 49,858 26,466 49,858 26,466
For instruments still held, changes in unrealized gains/(losses) included in Earnings (1,798) 2,888 (1,304) 6,808
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Sovereign obligations        
Assets:        
Beginning balance 23      
Total gains/losses (realized and unrealized) 0      
Purchases 0      
Sales 0      
Settlements 0      
Issuances 0      
Net transfers into/ (out of) Level 3 (23)      
Ending balance 0   0  
For instruments still held, changes in unrealized gains/(losses) included in Earnings 0      
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0      
Liabilities:        
Beginning Balance 1,159      
Total gains/losses (realized and unrealized) 0      
Purchases 0      
Sales 0      
Settlements 0      
Issuances 0      
Net transfers into/ (out of) Level 3 (1,159)      
Ending Balance 0   0  
For instruments still held, changes in unrealized gains/(losses) included in Earnings 0      
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0      
RMBS        
Assets:        
Beginning balance 1,186 21,692 1,477 21,826
Total gains/losses (realized and unrealized) (47) 205 (111) 33
Purchases 0 0 0 799
Sales 0 0 (204) (784)
Settlements (80) (612) (103) (1,126)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 (15,252) 0 (14,715)
Ending balance 1,059 6,033 1,059 6,033
For instruments still held, changes in unrealized gains/(losses) included in Earnings (17) (36) (57) 88
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
CMBS        
Assets:        
Beginning balance 3,732 2,671 2,333 2,003
Total gains/losses (realized and unrealized) (439) 201 (463) 158
Purchases 0 0 0 1,119
Sales 0 0 0 (393)
Settlements 0 (1,696) 0 (1,696)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 (1,423) 0 0 (15)
Ending balance 1,870 1,176 1,870 1,176
For instruments still held, changes in unrealized gains/(losses) included in Earnings 0 (824) (29) (740)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Liabilities:        
Beginning Balance 315 35 210 35
Total gains/losses (realized and unrealized) 0 0 0 0
Purchases 0 (35) 0 (35)
Sales 70 35 175 35
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 0 0 0
Ending Balance 385 35 385 35
For instruments still held, changes in unrealized gains/(losses) included in Earnings 0 0 0 0
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Other ABS        
Assets:        
Beginning balance 62,382 60,594 93,524 79,995
Total gains/losses (realized and unrealized) (781) 3,575 835 6,373
Purchases 21,501 12,835 37,797 34,476
Sales (1,688) (1,099) (17,238) (27,647)
Settlements (12,296) (14,408) (22,812) (26,465)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 15,660 9,058 (7,328) 3,823
Ending balance 84,778 70,555 84,778 70,555
For instruments still held, changes in unrealized gains/(losses) included in Earnings (1,065) 819 1,324 1,158
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Loans and other receivables        
Assets:        
Beginning balance 137,942 79,055 74,585 77,042
Total gains/losses (realized and unrealized) (3,764) 1,981 (9,814) 4,312
Purchases 15,598 26,948 90,616 37,431
Sales (23,603) (8,070) (25,983) (50,556)
Settlements (108) (156) (229) (273)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 11,687 19,792 8,577 51,594
Ending balance 137,752 119,550 137,752 119,550
For instruments still held, changes in unrealized gains/(losses) included in Earnings (4,764) (127) (9,726) 878
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Investments at fair value        
Assets:        
Beginning balance 125,824 45,472 34,557 67,108
Total gains/losses (realized and unrealized) (265) (4,037) 26,165 (2,098)
Purchases 37 133 72,315 133
Sales 0 0 0 (23,575)
Settlements (7,277) (1,183) (14,718) (1,183)
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 0 0 0 0
Ending balance 118,319 40,385 118,319 40,385
For instruments still held, changes in unrealized gains/(losses) included in Earnings (265) (4,037) 26,235 (3,989)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Loans        
Liabilities:        
Beginning Balance 11,541 14,916 15,770 16,635
Total gains/losses (realized and unrealized) 10 (7) (15) 1,441
Purchases (1,911) (637) (12,315) (6,872)
Sales 1,089 6,330 10,194 8,817
Settlements 0 44 (87) 0
Issuances 0 0 0 0
Net transfers into/ (out of) Level 3 7,554 (257) 4,736 368
Ending Balance 18,283 20,389 18,283 20,389
For instruments still held, changes in unrealized gains/(losses) included in Earnings 119 (167) 104 (884)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Net derivatives        
Liabilities:        
Beginning Balance 47,770 305,506 67,769 26,017
Total gains/losses (realized and unrealized) (9,100) (8,965) (88,018) 16,813
Purchases (1,559) (36) (1,559) (82)
Sales 0 33,715 0 66,304
Settlements (8,262) 593 0 506
Issuances 0 0 21,024 0
Net transfers into/ (out of) Level 3 46,148 (103,755) 75,781 117,500
Ending Balance 74,997 227,058 74,997 227,058
For instruments still held, changes in unrealized gains/(losses) included in Earnings 9,903 8,372 86,050 (17,358)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Other secured financings        
Liabilities:        
Beginning Balance 32,377 2,168 25,905 1,543
Total gains/losses (realized and unrealized) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (30,015) 0 (23,543) 0
Issuances 0 325 0 950
Net transfers into/ (out of) Level 3 0 0 0 0
Ending Balance 2,362 2,493 2,362 2,493
For instruments still held, changes in unrealized gains/(losses) included in Earnings 0 0 0 0
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income 0 0 0 0
Long-term debt        
Liabilities:        
Beginning Balance 794,460 723,115 881,732 676,028
Total gains/losses (realized and unrealized) (146,261) 15,986 (240,698) 41,064
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements (4,950) 0 0 0
Issuances 76,443 28,565 100,195 50,295
Net transfers into/ (out of) Level 3 19,661 27,432 (1,876) 27,711
Ending Balance 739,353 795,098 739,353 795,098
For instruments still held, changes in unrealized gains/(losses) included in Earnings 114,362 3,057 175,615 20,565
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income $ 31,899 $ (19,043) $ 65,083 $ (61,629)