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)