Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Assets:
Total gains/losses (realized and unrealized)	$ 10,900	$ 16,800	$ 65,700	$ 50,600
Liabilities:
Total gains/losses (realized and unrealized)	(83,000)	3,700	(473,300)	60,200
Corporate equity securities
Assets:
Beginning balance	199,468	71,724	76,082	75,797
Total gains/losses (realized and unrealized)	(2,161)	14,302	46,147	29,430
Purchases	92	208	79,729	7,900
Sales	(189)	(1,488)	(2,941)	(37,794)
Settlements	0	(16)	(298)	(16)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(1,444)	338	(2,953)	9,751
Ending balance	195,766	85,068	195,766	85,068
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(2,254)	15,390	45,408	14,231
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	3,749	4,462	4,635	4,434
Total gains/losses (realized and unrealized)	(278)	(75)	(3,708)	(12)
Purchases	(940)	0	(3,255)	(22)
Sales	39	0	4,898	0
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	0	0	(13)
Ending Balance	2,570	4,387	2,570	4,387
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(268)	75	2,781	13
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Corporate debt securities
Assets:
Beginning balance	20,813	7,985	11,803	23,146
Total gains/losses (realized and unrealized)	(605)	405	3,596	1,600
Purchases	759	14,898	12,689	1,513
Sales	(1,183)	(17,317)	(16,513)	(3,721)
Settlements	0	(20)	(9)	(128)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(1,572)	2,205	6,646	(14,254)
Ending balance	18,212	8,156	18,212	8,156
For instruments still held, changes in unrealized gains/(losses) included in Earnings	699	192	1,537	331
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	401	927	482	141
Total gains/losses (realized and unrealized)	26	(7)	15	375
Purchases	0	0	(70)	0
Sales	0	0	0	12
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	(392)	0	0
Ending Balance	427	528	427	528
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(28)	7	(23)	(375)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
CDOs and CLOs
Assets:
Beginning balance	49,858	26,466	31,944	10,513
Total gains/losses (realized and unrealized)	685	2,539	2,573	6,745
Purchases	13,133	50,199	34,756	58,868
Sales	(4,553)	(33,234)	(18,933)	(29,277)
Settlements	(3,604)	(1,518)	(8,178)	(1,916)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(5,591)	8,014	7,766	7,533
Ending balance	49,928	52,466	49,928	52,466
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(9,369)	(730)	(10,371)	(4,716)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	0		0
Total gains/losses (realized and unrealized)	(29)		(29)
Purchases	0		0
Sales	383		383
Settlements	0		0
Issuances	0		0
Net transfers into/ (out of) Level 3	0		0
Ending Balance	354		354
For instruments still held, changes in unrealized gains/(losses) included in Earnings	29		29
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0		0
RMBS
Assets:
Beginning balance	1,059	6,033	1,477	21,826
Total gains/losses (realized and unrealized)	(3,596)	(42)	(6,099)	(195)
Purchases	94	0	28,067	157
Sales	0	(417)	(187)	(784)
Settlements	(32)	(61)	(152)	(291)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	28,218	(4,077)	2,637	(19,277)
Ending balance	25,743	1,436	25,743	1,436
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(2,158)	(14)	(2,894)	(123)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
CMBS
Assets:
Beginning balance	1,870	1,176	2,333	2,003
Total gains/losses (realized and unrealized)	(2,663)	(103)	(18,549)	134
Purchases	0	1,607	0	2,590
Sales	0	0	0	(393)
Settlements	0	0	0	(1,639)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	32,403	0	47,826	(15)
Ending balance	31,610	2,680	31,610	2,680
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(621)	1,530	(2,420)	741
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	385	35	210	35
Total gains/losses (realized and unrealized)	0	0	0	0
Purchases	0	0	0	(35)
Sales	70	105	245	140
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	0	0	0
Ending Balance	455	140	455	140
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	84,778	70,555	93,524	79,995
Total gains/losses (realized and unrealized)	(1,800)	30	(1,446)	4,770
Purchases	17,487	18,611	51,966	38,785
Sales	0	(274)	(18,489)	(26,642)
Settlements	(13,217)	(14,426)	(36,349)	(25,966)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	4,245	2,937	2,287	6,491
Ending balance	91,493	77,433	91,493	77,433
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(7,432)	(3,145)	(17,168)	(6,955)
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	137,752	119,550	74,585	77,042
Total gains/losses (realized and unrealized)	1,616	(463)	(6,635)	10,062
Purchases	7,065	14,796	107,225	51,933
Sales	(21,492)	(29,557)	(63,530)	(55,693)
Settlements	(325)	(5,873)	(1,256)	(5,509)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(7,022)	(8,118)	7,205	12,500
Ending balance	117,594	90,335	117,594	90,335
For instruments still held, changes in unrealized gains/(losses) included in Earnings	1,536	817	(6,955)	1,714
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	118,319	40,385	34,557	67,108
Total gains/losses (realized and unrealized)	19,405	151	46,109	(1,942)
Purchases	2,184	16	74,499	144
Sales	(48)	0	(48)	(23,575)
Settlements	(640)	(371)	(15,897)	(1,554)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	0	0	0
Ending balance	139,220	40,181	139,220	40,181
For instruments still held, changes in unrealized gains/(losses) included in Earnings	19,381	151	45,512	(3,832)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Loans
Liabilities:
Beginning Balance	18,283	20,389	15,770	16,635
Total gains/losses (realized and unrealized)	157	(8)	94	1,308
Purchases	(16,983)	(3,118)	(22,566)	(7,182)
Sales	1,937	1,710	5,417	14,083
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	9,300	6,239	13,979	368
Ending Balance	12,694	25,212	12,694	25,212
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(1,428)	6	(1,478)	(4,094)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Net derivatives
Liabilities:
Beginning Balance	74,997	227,058	67,769	26,017
Total gains/losses (realized and unrealized)	(23,380)	20,869	(152,927)	33,173
Purchases	(1,929)	(1,868)	(1,559)	(1,548)
Sales	0	0	1,285	49,871
Settlements	(20,954)	665	0	768
Issuances	0	0	21,024	0
Net transfers into/ (out of) Level 3	43,764	(79,662)	136,906	58,781
Ending Balance	72,498	167,062	72,498	167,062
For instruments still held, changes in unrealized gains/(losses) included in Earnings	19,719	(22,433)	150,713	(33,007)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Other secured financings
Liabilities:
Beginning Balance	2,362	2,493	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	0	0	(23,543)	0
Issuances	0	0	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	739,353	795,098	881,732	676,028
Total gains/losses (realized and unrealized)	(59,521)	(17,106)	(316,778)	25,323
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Issuances	0	22,330	89,263	58,000
Net transfers into/ (out of) Level 3	41,283	(14,710)	66,898	26,261
Ending Balance	721,115	785,612	721,115	785,612
For instruments still held, changes in unrealized gains/(losses) included in Earnings	75,930	13,204	265,288	31,992
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	$ (16,409)	$ 3,902	$ 51,490	$ (57,315)