Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2020
Assets:
Total gains/(losses) (realized and unrealized)	$ 31,800	$ 140,000	$ (46,300)
Liabilities:
Total gains/(losses) (realized and unrealized)	465,700	(12,900)	88,000
Transfers of liabilities from Level 2 to Level 3	$ 172,100	$ 74,300	$ 500
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues	Revenues
Corporate equity securities
Assets:
Beginning balance	$ 118,489	$ 116,089	$ 58,426
Total gains/(losses) (realized and unrealized)	(645)	19,213	1,411
Purchases	171,700	8,778	31,885
Sales	(62,474)	(34,307)	(37,706)
Settlements	(298)	(49)	0
Issuances	0	0	34,688
Net transfers into/ (out of) Level 3	13,575	8,765	27,385
Ending balance	240,347	118,489	116,089
Changes in unrealized gains/(losses) included in earnings for instruments still held	7,286	11,589	4,845
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Liabilities:
Beginning balance	4,635	4,434	4,487
Total gains/(losses) (realized and unrealized)	(3,611)	(83)	456
Purchases	(815)	(21)	(513)
Sales	4,858	318	0
Settlements	0	0	0
Issuances	0	0	0
Net transfers into/ (out of) Level 3	(4,317)	(13)	4
Ending balance	750	4,635	4,434
Changes in unrealized gains/ (losses) included in earnings for instruments still held	2,382	83	(81)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Corporate debt securities
Assets:
Beginning balance	11,803	23,146	7,490
Total gains/(losses) (realized and unrealized)	946	1,565	83
Purchases	18,686	11,161	1,607
Sales	(23,964)	(7,978)	(391)
Settlements	(9)	(1,417)	(602)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	22,770	(14,674)	14,959
Ending balance	30,232	11,803	23,146
Changes in unrealized gains/(losses) included in earnings for instruments still held	(2,087)	1,724	(270)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Liabilities:
Beginning balance	482	141	340
Total gains/(losses) (realized and unrealized)	88	1,205	(268)
Purchases	(70)	(815)	(325)
Sales	0	0	394
Settlements	0	(49)	0
Issuances	0	0	0
Net transfers into/ (out of) Level 3	0	0	0
Ending balance	500	482	141
Changes in unrealized gains/ (losses) included in earnings for instruments still held	(88)	(139)	27
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
CDOs and CLOs
Assets:
Beginning balance	31,946	17,972	28,788
Total gains/(losses) (realized and unrealized)	7,099	8,092	(3,821)
Purchases	44,995	32,618	10,913
Sales	(22,600)	(27,332)	(14,389)
Settlements	(16,634)	(5,042)	(5,201)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	11,018	5,638	1,682
Ending balance	55,824	31,946	17,972
Changes in unrealized gains/(losses) included in earnings for instruments still held	(10,938)	(4,390)	(17,212)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
RMBS
Assets:
Beginning balance	1,477	21,826	17,740
Total gains/(losses) (realized and unrealized)	(13,210)	(243)	(934)
Purchases	35,774	708	7,887
Sales	(372)	(1,183)	(969)
Settlements	(240)	(354)	(1,053)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	4,188	(19,277)	(845)
Ending balance	27,617	1,477	21,826
Changes in unrealized gains/(losses) included in earnings for instruments still held	(7,728)	(131)	(599)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
CMBS
Assets:
Beginning balance	2,333	2,003	6,110
Total gains/(losses) (realized and unrealized)	(733)	(1,694)	(827)
Purchases	0	2,445	393
Sales	(749)	(393)	(1,856)
Settlements	0	(13)	(1,787)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	(12)	(15)	(30)
Ending balance	839	2,333	2,003
Changes in unrealized gains/(losses) included in earnings for instruments still held	(703)	(733)	(295)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Liabilities:
Beginning balance	210	35	35
Total gains/(losses) (realized and unrealized)	0	0	0
Purchases	0	(35)	0
Sales	280	210	35
Settlements	0	0	0
Issuances	0	0	0
Net transfers into/ (out of) Level 3	0	0	(35)
Ending balance	490	210	35
Changes in unrealized gains/ (losses) included in earnings for instruments still held	0	0	0
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Other ABS
Assets:
Beginning balance	93,524	79,995	42,563
Total gains/(losses) (realized and unrealized)	(6,467)	5,335	(3,848)
Purchases	74,353	65,277	69,701
Sales	(20,362)	(21,727)	(1,638)
Settlements	(39,647)	(45,397)	(43,072)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	(6,724)	10,041	16,289
Ending balance	94,677	93,524	79,995
Changes in unrealized gains/(losses) included in earnings for instruments still held	(26,982)	(14,471)	(5,945)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0
Loans and other receivables
Assets:
Beginning balance	178,417	186,568	154,322
Total gains/(losses) (realized and unrealized)	(1,912)	1,250	(6,203)
Purchases	45,536	50,167	110,116
Sales	(33,692)	(55,848)	(25,568)
Settlements	(48,218)	(20,442)	(57,455)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	28,744	16,722	11,356
Ending balance	168,875	178,417	186,568
Changes in unrealized gains/(losses) included in earnings for instruments still held	(11,610)	(4,905)	(5,522)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Investments at fair value
Assets:
Beginning balance	154,373	213,946	205,412
Total gains/(losses) (realized and unrealized)	46,735	112,012	(31,666)
Purchases	74,984	22,957	55,836
Sales	(74,742)	(47,243)	(167)
Settlements	(15,951)	(9,809)	(17,298)
Issuances	0	0	0
Net transfers into/ (out of) Level 3	(23,407)	(137,490)	1,829
Ending balance	161,992	154,373	213,946
Changes in unrealized gains/(losses) included in earnings for instruments still held	33,294	25,723	(33,514)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Securities purchased under agreements to resell
Assets:
Beginning balance		0	25,000
Total gains/(losses) (realized and unrealized)			0
Purchases			0
Sales			0
Settlements			(25,000)
Issuances			0
Net transfers into/ (out of) Level 3			0
Ending balance			0
Changes in unrealized gains/(losses) included in earnings for instruments still held			0
Loans
Liabilities:
Beginning balance	9,925	6,913	1,690
Total gains/(losses) (realized and unrealized)	1,197	3,384	5,297
Purchases	(5,173)	(469)	(440)
Sales	0	220	0
Settlements	96	0	0
Issuances	0	0	0
Net transfers into/ (out of) Level 3	(2,881)	(123)	366
Ending balance	3,164	9,925	6,913
Changes in unrealized gains/ (losses) included in earnings for instruments still held	(2,484)	(1,523)	(5,409)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Transfers of liabilities from Level 2 to Level 3			400
Net derivatives
Liabilities:
Beginning balance	67,769	26,017	77,168
Total gains/(losses) (realized and unrealized)	(181,750)	7,246	(40)
Purchases	(1,559)	0	(7,446)
Sales	1,285	0	19,376
Settlements	0	(1,491)	(2,216)
Issuances	28,436	44,453	0
Net transfers into/ (out of) Level 3	145,343	(8,456)	(60,825)
Ending balance	59,524	67,769	26,017
Changes in unrealized gains/ (losses) included in earnings for instruments still held	168,304	(7,371)	(1,805)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	0	0	0
Transfers of liabilities from Level 2 to Level 3	152,800	16,200
Other secured financings
Liabilities:
Beginning balance	25,905	1,543	0
Total gains/(losses) (realized and unrealized)	(650)	(649)	(2,475)
Purchases	0	0	0
Sales	0	0	0
Settlements	(23,543)	0	0
Issuances	0	25,011	4,018
Net transfers into/ (out of) Level 3	0	0	0
Ending balance	1,712	25,905	1,543
Changes in unrealized gains/ (losses) included in earnings for instruments still held	650	649	2,475
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held		0
Long-term debt
Liabilities:
Beginning balance	881,732	676,028	480,069
Total gains/(losses) (realized and unrealized)	(280,967)	(22,132)	84,930
Purchases	0	0	0
Sales	0	0	0
Settlements	(3,919)	0	(57,088)
Issuances	83,874	169,975	248,718
Net transfers into/ (out of) Level 3	(19,597)	57,861	(80,601)
Ending balance	661,123	881,732	676,028
Changes in unrealized gains/ (losses) included in earnings for instruments still held	239,400	85,260	(51,567)
Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held	41,567	(63,126)	$ (33,363)
Structured notes
Liabilities:
Transfers of liabilities from Level 2 to Level 3	$ 19,300	$ 57,900