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Fair Value Disclosures (Level 3 Rollforwards) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Assets:        
Total gains (losses) (realized and unrealized) $ 42,200 $ (150,300) $ (80,700) $ (123,300)
Liabilities:        
Total gains/ losses (realized and unrealized) 124,300 (12,800) (50,100) (55,800)
Fair value, Liabilities, change in unrealized gains/(losses) included in other comprehensive income relating to instruments still held (88,300) 700 17,300 9,800
Corporate equity securities        
Assets:        
Beginning Balance 76,140 59,572 58,426 52,192
Total gains (losses) (realized and unrealized) (597) 12,547 (3,914) 15,499
Purchases 779 16,508 3,406 23,172
Sales 0 (17,502) (13,555) (25,431)
Settlements 0 0 0 (669)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 1,619 (20,255) 33,578 (13,893)
Ending Balance 77,941 50,870 77,941 50,870
Changes in unrealized gains/losses included in earnings relating to instruments still held (597) 12,067 (775) 14,071
Liabilities:        
Beginning Balance 4,190 221 4,487 0
Total gains/ losses (realized and unrealized) (12) 401 258 401
Purchases 0 (221) (567) 0
Sales 0 0 0 0
Settlements 0 (190) 0 (190)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 189 0 189 0
Ending Balance 4,367 211 4,367 211
Changes in unrealized gains/losses included in earnings relating to instruments still held 12 (35) 98 (35)
Corporate debt securities        
Assets:        
Beginning Balance 25,178 8,346 7,490 9,484
Total gains (losses) (realized and unrealized) (889) (3,072) (162) (4,904)
Purchases 4 1,175 285 6,080
Sales (394) (1,942) (489) (10,544)
Settlements 0 (85) (602) (553)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (630) 4,866 16,747 9,725
Ending Balance 23,269 9,288 23,269 9,288
Changes in unrealized gains/losses included in earnings relating to instruments still held (881) (3,047) (591) (5,325)
Liabilities:        
Beginning Balance 163 669 340 522
Total gains/ losses (realized and unrealized) (15) (650) (261) (867)
Purchases 0 (34) (325) 0
Sales 0 0 394 0
Settlements 0 (369) 0 (524)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 0 1,586 0 2,071
Ending Balance 148 1,202 148 1,202
Changes in unrealized gains/losses included in earnings relating to instruments still held 15 649 20 867
CDOs and CLOs        
Assets:        
Beginning Balance 31,551 25,912 28,788 36,105
Total gains (losses) (realized and unrealized) 3,813 (1,499) (8,000) (4,320)
Purchases 39 0 10,883 48,112
Sales (7,539) 0 (20,935) (43,230)
Settlements (2,318) (609) (6,847) (3,014)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 10,576 6,454 32,233 (3,395)
Ending Balance 36,122 30,258 36,122 30,258
Changes in unrealized gains/losses included in earnings relating to instruments still held 159 (2,097) (20,739) (6,781)
Residential mortgage-backed securities        
Assets:        
Beginning Balance 22,339 17,266 17,740 19,603
Total gains (losses) (realized and unrealized) 1,240 (1,917) (1,347) (2,573)
Purchases 0 0 7,625 2,166
Sales 0 (65) 0 (2,022)
Settlements (774) (22) (496) (171)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 5,512 2,667 4,795 926
Ending Balance 28,317 17,929 28,317 17,929
Changes in unrealized gains/losses included in earnings relating to instruments still held 1,262 (1,435) (1,811) (2,166)
Commercial mortgage-backed securities        
Assets:        
Beginning Balance 4,461 12,530 6,110 10,886
Total gains (losses) (realized and unrealized) 202 (2,003) 232 (2,196)
Purchases 0 0 0 11
Sales 0 (1,703) 0 (2,023)
Settlements 0 (3,362) (1,785) (6,638)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 0 0 106 5,422
Ending Balance 4,663 5,462 4,663 5,462
Changes in unrealized gains/losses included in earnings relating to instruments still held 198 (3,143) 807 (4,326)
Liabilities:        
Beginning Balance 140 0 35 0
Total gains/ losses (realized and unrealized) 0 0 0 0
Purchases (140) 0 (35) 0
Sales 35 35 35 35
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into (out of) Level 3 0 0 0 0
Ending Balance 35 35 35 35
Changes in unrealized gains/losses included in earnings relating to instruments still held 0 0 0 0
Other asset-backed securities        
Assets:        
Beginning Balance 86,062 43,185 42,563 53,175
Total gains (losses) (realized and unrealized) (1,585) (1,689) (3,495) (929)
Purchases 3,313 13,497 29,096 14,698
Sales 0 (6,975) (664) (2,494)
Settlements (7,442) (5,500) (22,125) (30,623)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (17,011) (7,920) 17,962 771
Ending Balance 63,337 34,598 63,337 34,598
Changes in unrealized gains/losses included in earnings relating to instruments still held (5,101) (1,068) (13,012) (961)
Loans and other receivables        
Assets:        
Beginning Balance 121,129 98,484 114,080 46,985
Total gains (losses) (realized and unrealized) 13,109 (2,847) 966 3,933
Purchases 18,492 26,921 309,982 178,069
Sales (13,897) (33,409) (208,958) (166,496)
Settlements (355) (1,287) (57,371) (8,379)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 24,463 (12,299) 4,242 21,451
Ending Balance 162,941 75,563 162,941 75,563
Changes in unrealized gains/losses included in earnings relating to instruments still held 13,440 (2,392) 1,291 682
Investments at fair value        
Assets:        
Beginning Balance 154,238 408,739 205,412 396,254
Total gains (losses) (realized and unrealized) 24,179 (152,162) (62,415) (119,110)
Purchases 7,183 1,067 42,771 42,579
Sales 0 (296) (168) (18,598)
Settlements (13,102) 0 (13,102) 0
Issuances 0 0 0 0
Net transfers into (out of) Level 3 0 35,135 0 (8,642)
Ending Balance 172,498 292,483 172,498 292,483
Changes in unrealized gains/losses included in earnings relating to instruments still held 23,030 (152,162) (64,263) (119,110)
FXCM term loan        
Assets:        
Beginning Balance 53,765 56,600 59,120 73,150
Total gains (losses) (realized and unrealized) 2,777 2,293 (2,578) (8,669)
Purchases 0 0 0 1,500
Sales 0 0 0 0
Settlements 0 (303) 0 (7,391)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 0 0 0 0
Ending Balance 56,542 58,590 56,542 58,590
Changes in unrealized gains/losses included in earnings relating to instruments still held 2,777 2,293 (2,578) (8,669)
Loans to and investments in associated companies        
Assets:        
Beginning Balance 0   0  
Total gains (losses) (realized and unrealized) 0   0  
Purchases 0   0  
Sales 0   0  
Settlements 0   0  
Issuances 0   0  
Net transfers into (out of) Level 3 34,688   34,688  
Ending Balance 34,688   34,688  
Changes in unrealized gains/losses included in earnings relating to instruments still held 0   0  
Securities purchased under agreements to resell        
Assets:        
Beginning Balance   25,000 25,000 0
Total gains (losses) (realized and unrealized)   0 0 0
Purchases   0 0 0
Sales   0 0 0
Settlements   0 (25,000) 0
Issuances   0 0 25,000
Net transfers into (out of) Level 3   0 0 0
Ending Balance 0 25,000 0 25,000
Changes in unrealized gains/losses included in earnings relating to instruments still held   0 0 0
Loans        
Liabilities:        
Beginning Balance 10,674 9,428 9,463 6,376
Total gains/ losses (realized and unrealized) 6,636 (520) 2,986 (1,342)
Purchases (23,001) (10,281) (5,760) (8,553)
Sales 3,558 5,384 38,531 9,929
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into (out of) Level 3 48,727 12,619 1,374 10,220
Ending Balance 46,594 16,630 46,594 16,630
Changes in unrealized gains/losses included in earnings relating to instruments still held (6,591) 531 (3,366) 1,583
Net derivatives        
Liabilities:        
Beginning Balance 45,131 47,449 77,168 21,614
Total gains/ losses (realized and unrealized) (12,175) (19,519) (63,367) (48,746)
Purchases (1,404) 0 (6,732) (2,829)
Sales 13,089 6,766 26,656 16,313
Settlements (648) (14) (1,567) 1,609
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (21,568) 16,081 (9,733) 62,802
Ending Balance 22,425 50,763 22,425 50,763
Changes in unrealized gains/losses included in earnings relating to instruments still held 12,007 18,507 60,257 40,052
Other secured financings        
Liabilities:        
Beginning Balance 0   0  
Total gains/ losses (realized and unrealized) (617)   (617)  
Purchases 0   0  
Sales 0   0  
Settlements 0   0  
Issuances 4,019   4,019  
Net transfers into (out of) Level 3 0   0  
Ending Balance 3,402   3,402  
Changes in unrealized gains/losses included in earnings relating to instruments still held 617   617  
Long-term debt        
Liabilities:        
Beginning Balance 497,040 236,562 480,069 200,745
Total gains/ losses (realized and unrealized) 130,463 7,455 10,851 (5,286)
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (2,000) (11,250)
Issuances 5,749 114,641 202,046 204,710
Net transfers into (out of) Level 3 (2,992) (10,595) (60,706) (40,856)
Ending Balance 630,260 348,063 630,260 348,063
Changes in unrealized gains/losses included in earnings relating to instruments still held $ (42,163) $ (8,162) $ (28,153) $ (4,517)