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Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total gains (losses) (realized and unrealized) $ 142,300 $ (51,600) $ (217,000)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total gains (losses) (realized and unrealized) (12,600) 82,100 (44,500)
Change in unrealized gains/(losses) included in other comprehensive income relating to instruments still held 63,100 33,400 11,000
Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 75,904 58,426 52,192
Total gains (losses) (realized and unrealized) 28,556 (4,086) (11,407)
Purchases 8,778 31,885 69,065
Sales (34,307) (37,706) (28,159)
Settlements (49) 0 (18,208)
Issuances 0 0 0
Net transfers into (out of) Level 3 8,765 27,385 (5,057)
Ending Balance 87,647 75,904 58,426
Change in unrealized gains/(losses) relating to instruments still held 20,932 (652) (13,848)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 4,434 4,487 0
Total gains (losses) (realized and unrealized) (83) 456 (2,649)
Purchases (21) (513) (4,322)
Sales 318 0 11,458
Settlements 0 0 0
Issuances 0 0 0
Net transfers into (out of) Level 3 (13) 4 0
Ending Balance 4,635 4,434 4,487
Change in unrealized gains/(losses) relating to instruments still held 83 (81) 1,928
Corporate debt securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 23,146 7,490 9,484
Total gains (losses) (realized and unrealized) 1,565 83 (4,860)
Purchases 11,161 1,607 8,900
Sales (7,978) (391) (13,854)
Settlements (1,417) (602) (379)
Issuances 0 0 0
Net transfers into (out of) Level 3 (14,674) 14,959 8,199
Ending Balance 11,803 23,146 7,490
Change in unrealized gains/(losses) relating to instruments still held 1,724 (270) (6,176)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 141 340 522
Total gains (losses) (realized and unrealized) 1,205 (268) (381)
Purchases (815) (325) (457)
Sales 0 394 0
Settlements (49) 0 (524)
Issuances 0 0 0
Net transfers into (out of) Level 3 0 0 1,180
Ending Balance 482 141 340
Change in unrealized gains/(losses) relating to instruments still held (139) 27 383
Collateralized debt obligations and collateralized loan obligations      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 17,972 28,788 36,105
Total gains (losses) (realized and unrealized) 8,092 (3,821) (514)
Purchases 32,618 10,913 49,658
Sales (27,332) (14,389) (38,147)
Settlements (5,042) (5,201) (12,494)
Issuances 0 0 0
Net transfers into (out of) Level 3 5,638 1,682 (5,820)
Ending Balance 31,946 17,972 28,788
Change in unrealized gains/(losses) relating to instruments still held (4,390) (17,212) (2,330)
Residential mortgage backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 21,826 17,740 19,603
Total gains (losses) (realized and unrealized) (243) (934) (1,669)
Purchases 708 7,887 1,954
Sales (1,183) (969) (2,472)
Settlements (354) (1,053) (152)
Issuances 0 0 0
Net transfers into (out of) Level 3 (19,277) (845) 476
Ending Balance 1,477 21,826 17,740
Change in unrealized gains/(losses) relating to instruments still held (131) (599) (530)
Commercial mortgage-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 2,003 6,110 10,886
Total gains (losses) (realized and unrealized) (1,694) (827) (2,888)
Purchases 2,445 393 206
Sales (393) (1,856) (2,346)
Settlements (13) (1,787) (5,317)
Issuances 0 0 0
Net transfers into (out of) Level 3 (15) (30) 5,569
Ending Balance 2,333 2,003 6,110
Change in unrealized gains/(losses) relating to instruments still held (733) (295) (2,366)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 35 35 0
Total gains (losses) (realized and unrealized) 0 0 35
Purchases (35) 0 0
Sales 210 35 0
Settlements 0 0 0
Issuances 0 0 0
Net transfers into (out of) Level 3 0 (35) 0
Ending Balance 210 35 35
Change in unrealized gains/(losses) relating to instruments still held 0 0 35
Other asset backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 79,995 42,563 53,175
Total gains (losses) (realized and unrealized) 5,335 (3,848) 433
Purchases 65,277 69,701 104,097
Sales (21,727) (1,638) (73,335)
Settlements (45,397) (43,072) (51,374)
Issuances 0 0 0
Net transfers into (out of) Level 3 10,041 16,289 9,567
Ending Balance 93,524 79,995 42,563
Change in unrealized gains/(losses) relating to instruments still held (14,471) (5,945) (98)
Loans and other receivables      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 134,636 114,080 46,985
Total gains (losses) (realized and unrealized) 6,995 (12,341) (4,507)
Purchases 58,993 123,485 106,965
Sales (61,560) (36,929) (48,350)
Settlements (20,442) (57,455) (5,788)
Issuances 0 0 0
Net transfers into (out of) Level 3 16,617 3,796 18,775
Ending Balance 135,239 134,636 114,080
Change in unrealized gains/(losses) relating to instruments still held 3,136 (11,153) (2,321)
Investments at fair value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 213,946 205,412 396,254
Total gains (losses) (realized and unrealized) 112,012 (31,666) (183,480)
Purchases 22,957 55,836 11,236
Sales (47,243) (167) (28,749)
Settlements (9,809) (17,298) 0
Issuances 0 0 0
Net transfers into (out of) Level 3 (137,490) 1,829 10,151
Ending Balance 154,373 213,946 205,412
Change in unrealized gains/(losses) relating to instruments still held 25,723 (33,514) (180,629)
Investment in senior secured term loan      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 59,455 59,120 73,150
Total gains (losses) (realized and unrealized) (9,000) 335 (8,139)
Purchases 0 0 1,500
Sales 0 0 0
Settlements 0 0 (7,391)
Issuances 0 0 0
Net transfers into (out of) Level 3 0 0 0
Ending Balance 50,455 59,455 59,120
Change in unrealized gains/(losses) relating to instruments still held (9,000) 335 (8,139)
Loans to and investments in associated companies      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 40,185 0  
Total gains (losses) (realized and unrealized) (9,343) 5,497  
Purchases 0 0  
Sales 0 0  
Settlements 0 0  
Issuances 0 0  
Net transfers into (out of) Level 3 0 34,688  
Ending Balance 30,842 40,185 0
Change in unrealized gains/(losses) relating to instruments still held (9,343) 5,497  
Securities purchased under agreements to resell      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 25,000 0
Total gains (losses) (realized and unrealized)   0 0
Purchases   0 0
Sales   0 0
Settlements   (25,000) 0
Issuances   0 25,000
Net transfers into (out of) Level 3   0 0
Ending Balance   0 25,000
Change in unrealized gains/(losses) relating to instruments still held   0 0
Loans      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 16,635 9,463 6,376
Total gains (losses) (realized and unrealized) 1,826 (520) (1,382)
Purchases (8,549) (6,061) (2,573)
Sales 5,673 13,851 6,494
Settlements 0 0 0
Issuances 0 0 0
Net transfers into (out of) Level 3 185 (98) 548
Ending Balance 15,770 16,635 9,463
Change in unrealized gains/(losses) relating to instruments still held (1,825) 360 1,382
Derivatives      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 26,017 77,168 21,614
Total gains (losses) (realized and unrealized) 7,246 (40) (21,452)
Purchases 0 (7,446) (4,323)
Sales 0 19,376 36,144
Settlements (1,491) (2,216) 2,227
Issuances 44,453 0 0
Net transfers into (out of) Level 3 (8,456) (60,825) 42,958
Ending Balance 67,769 26,017 77,168
Change in unrealized gains/(losses) relating to instruments still held (7,371) (1,805) 12,098
Other secured financings      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,543 0  
Total gains (losses) (realized and unrealized) (649) (2,475)  
Purchases 0 0  
Sales 0 0  
Settlements 0 0  
Issuances 25,011 4,018  
Net transfers into (out of) Level 3 0 0  
Ending Balance 25,905 1,543 0
Change in unrealized gains/(losses) relating to instruments still held 649 2,475  
Long-term debt      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 676,028 480,069 200,745
Total gains (losses) (realized and unrealized) (22,132) 84,930 (18,662)
Purchases 0 0 0
Sales 0 0 0
Settlements 0 (57,088) (11,250)
Issuances 169,975 248,718 348,275
Net transfers into (out of) Level 3 57,861 (80,601) (39,039)
Ending Balance 881,732 676,028 480,069
Change in unrealized gains/(losses) relating to instruments still held $ 85,260 $ (51,567) $ 29,656