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Fair Value Disclosures (Level 3 Rollforwards) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2020
May 31, 2019
May 31, 2020
May 31, 2019
Assets:        
Total gains (losses) (realized and unrealized) $ (92,200) $ 23,200 $ (127,500) $ 23,300
Liabilities:        
Total gains/ losses (realized and unrealized) (124,300) (14,100) (144,700) (42,800)
Fair value, Liabilities, change in unrealized gains/(losses) included in other comprehensive income relating to instruments still held 91,800 (400) 106,100 9,000
Corporate equity securities        
Assets:        
Beginning Balance 103,683 55,576 58,426 52,192
Total gains (losses) (realized and unrealized) (5,346) 1,808 (12,972) 5,239
Purchases 63 221 3,016 785
Sales (68) (179) (2,017) (2,031)
Settlements 0 (551) 0 (720)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (22,192) 2,697 29,687 4,107
Ending Balance 76,140 59,572 76,140 59,572
Changes in unrealized gains/losses included in earnings relating to instruments still held (5,247) 1,909 (12,899) 7,085
Liabilities:        
Beginning Balance 4,275 78 4,487 0
Total gains/ losses (realized and unrealized) (60) (74) 216 (76)
Purchases 0 (1,520) (513) (1,546)
Sales 0 1,737 0 1,843
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (25) 0 0 0
Ending Balance 4,190 221 4,190 221
Changes in unrealized gains/losses included in earnings relating to instruments still held 60 0 140 0
Corporate debt securities        
Assets:        
Beginning Balance 25,090 10,930 7,490 9,484
Total gains (losses) (realized and unrealized) (1,480) (306) 1,560 (108)
Purchases 328 816 766 2,181
Sales (365) 0 (479) (2,130)
Settlements (1) (325) (602) (1,177)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 1,606 (2,769) 16,443 96
Ending Balance 25,178 8,346 25,178 8,346
Changes in unrealized gains/losses included in earnings relating to instruments still held (1,464) (307) 1,190 (53)
Liabilities:        
Beginning Balance 767 730 340 522
Total gains/ losses (realized and unrealized) (23) (148) (27) (382)
Purchases (20) (7) (150) (73)
Sales 0 1 0 93
Settlements 0 22 0 22
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (561) 71 0 487
Ending Balance 163 669 163 669
Changes in unrealized gains/losses included in earnings relating to instruments still held 0 90 5 305
CDOs and CLOs        
Assets:        
Beginning Balance 29,784 43,144 28,788 36,105
Total gains (losses) (realized and unrealized) (12,374) (1,663) (13,589) (1,233)
Purchases 0 0 9,426 4,782
Sales (8,471) 0 (11,849) 0
Settlements (2,598) (991) (4,122) (2,130)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 25,210 (14,578) 22,897 (11,612)
Ending Balance 31,551 25,912 31,551 25,912
Changes in unrealized gains/losses included in earnings relating to instruments still held (16,451) (2,656) (17,410) (3,127)
Residential mortgage-backed securities        
Assets:        
Beginning Balance 16,970 20,963 17,740 19,603
Total gains (losses) (realized and unrealized) (1,773) (802) (2,248) (316)
Purchases 1,380 0 2,062 39
Sales 0 0 0 0
Settlements (7) (18) (10) (45)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 5,769 (2,877) 4,795 (2,015)
Ending Balance 22,339 17,266 22,339 17,266
Changes in unrealized gains/losses included in earnings relating to instruments still held (1,733) (759) (2,195) (271)
Commercial mortgage-backed securities        
Assets:        
Beginning Balance 4,264 12,820 6,110 10,886
Total gains (losses) (realized and unrealized) 53 (357) (95) (180)
Purchases 0 0 0 11
Sales 0 (331) 0 (331)
Settlements 0 (3,238) (1,660) (3,278)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 144 3,636 106 5,422
Ending Balance 4,461 12,530 4,461 12,530
Changes in unrealized gains/losses included in earnings relating to instruments still held 53 (1,292) (680) (1,183)
Liabilities:        
Beginning Balance 35 70 35  
Total gains/ losses (realized and unrealized) 0 (70) 0  
Purchases 0 0 (35)  
Sales 105 0 140  
Settlements 0 0 0  
Issuances 0 0 0  
Net transfers into (out of) Level 3 0 0 0  
Ending Balance 140 0 140 0
Changes in unrealized gains/losses included in earnings relating to instruments still held 0 0 0  
Other asset-backed securities        
Assets:        
Beginning Balance 41,903 35,886 42,563 53,175
Total gains (losses) (realized and unrealized) (2,380) 3,070 (2,848) (1,014)
Purchases 11,038 16,531 33,917 25,316
Sales 0 (8,868) (664) (13,247)
Settlements (8,490) (8,549) (17,361) (9,529)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 43,991 5,115 30,455 (11,516)
Ending Balance 86,062 43,185 86,062 43,185
Changes in unrealized gains/losses included in earnings relating to instruments still held (5,087) 3,563 (7,226) (522)
Loans and other receivables        
Assets:        
Beginning Balance 103,243 78,051 114,080 46,985
Total gains (losses) (realized and unrealized) (1,113) (2,753) (5,348) 2,434
Purchases 45,984 38,780 116,047 77,004
Sales (46,939) (13,898) (76,227) (33,549)
Settlements (128) (2,438) (56,998) (3,378)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 20,082 742 29,575 8,988
Ending Balance 121,129 98,484 121,129 98,484
Changes in unrealized gains/losses included in earnings relating to instruments still held (1,069) (1,277) (8,989) 844
Investments at fair value        
Assets:        
Beginning Balance 184,507 421,098 205,412 396,254
Total gains (losses) (realized and unrealized) (59,962) 35,594 (86,594) 29,454
Purchases 10,599 10,169 35,588 41,512
Sales (91) (18,302) (168) (18,302)
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into (out of) Level 3 19,185 (39,820) 0 (40,179)
Ending Balance 154,238 408,739 154,238 408,739
Changes in unrealized gains/losses included in earnings relating to instruments still held (59,962) 35,594 (86,594) 29,454
FXCM term loan        
Assets:        
Beginning Balance 61,628 73,600 59,120 73,150
Total gains (losses) (realized and unrealized) (7,863) (11,412) (5,355) (10,962)
Purchases 0 1,500 0 1,500
Sales 0 0 0 0
Settlements 0 (7,088) 0 (7,088)
Issuances 0 0 0 0
Net transfers into (out of) Level 3 0 0 0 0
Ending Balance 53,765 56,600 53,765 56,600
Changes in unrealized gains/losses included in earnings relating to instruments still held (7,863) (11,412) (5,355) (10,962)
Securities purchased under agreements to resell        
Assets:        
Beginning Balance   0 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   25,000 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 7,859 3,420 9,463 6,376
Total gains/ losses (realized and unrealized) 1,015 (191) 1,072 (401)
Purchases (2,785) (1,678) (12,958) (3,946)
Sales 3,290 1,537 3,290 7,963
Settlements 0 0 0 0
Issuances 0 0 0 0
Net transfers into (out of) Level 3 1,295 6,340 9,807 (564)
Ending Balance 10,674 9,428 10,674 9,428
Changes in unrealized gains/losses included in earnings relating to instruments still held (1,015) 364 (1,075) 579
Net derivatives        
Liabilities:        
Beginning Balance 110,843 28,975 77,168 21,614
Total gains/ losses (realized and unrealized) (32,744) (14,760) (44,729) (29,079)
Purchases (10,810) (25) (11,088) (2,829)
Sales 33,196 4,175 38,823 7,259
Settlements (603) 1,974 (1,010) 2,031
Issuances 0 0 0 0
Net transfers into (out of) Level 3 (54,751) 27,110 (14,033) 48,453
Ending Balance 45,131 47,449 45,131 47,449
Changes in unrealized gains/losses included in earnings relating to instruments still held 34,259 7,565 32,211 19,607
Long-term Debt:        
Liabilities:        
Beginning Balance 543,463 283,139 480,069 200,745
Total gains/ losses (realized and unrealized) (92,480) 1,163 (101,267) (12,854)
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 (5,585) 0 (11,250)
Issuances 66,916 39,385 175,498 101,872
Net transfers into (out of) Level 3 (20,859) (81,540) (57,260) (41,951)
Ending Balance 497,040 236,562 497,040 236,562
Changes in unrealized gains/losses included in earnings relating to instruments still held $ 664 $ (813) $ (4,802) $ 3,827