Fair Value Disclosures - Level 3 Rollforwards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2024	Aug. 31, 2023
Assets:
Total gains/losses (realized and unrealized)	$ (7,300)	$ 42,900	$ (53,800)	$ 69,400
Liabilities:
Total gains/losses (realized and unrealized)	16,500	27,500	23,300	31,700
Corporate equity securities
Assets:
Beginning balance	178,755	267,913	181,294	240,347
Total gains/losses (realized and unrealized)	9,887	(85,416)	(3,969)	(58,302)
Purchases	12,874	333	28,576	895
Sales	(1,035)	(331)	(2,480)	(1,228)
Settlements	(198)	0	0	(630)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	360	(3,710)	(2,778)	(2,293)
Ending balance	200,643	178,789	200,643	178,789
For instruments still held, changes in unrealized gains/(losses) included in Earnings	10,184	(84,507)	(3,179)	(51,782)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	708	465	676	750
Total gains/losses (realized and unrealized)	4	0	5	(285)
Purchases	0	0	0	0
Sales	2,264	0	2,289	0
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(6)	0	0	0
Ending Balance	2,970	465	2,970	465
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(4)	0	(5)	285
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Corporate debt securities
Assets:
Beginning balance	38,717	42,642	26,112	30,232
Total gains/losses (realized and unrealized)	93	(176)	3,060	2,087
Purchases	0	4,685	14,894	11,519
Sales	(1,753)	(4,157)	(6,735)	(20,410)
Settlements	0	0	(200)	(200)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(5,879)	(11,282)	(5,953)	8,484
Ending balance	31,178	31,712	31,178	31,712
For instruments still held, changes in unrealized gains/(losses) included in Earnings	1,181	416	7,309	(1,394)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	506	267	124	500
Total gains/losses (realized and unrealized)	0	1	(23)	(40)
Purchases	(246)	0	0	(234)
Sales	0	0	0	0
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	(42)	159	0
Ending Balance	260	226	260	226
For instruments still held, changes in unrealized gains/(losses) included in Earnings	0	(1)	23	29
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
CDOs and CLOs
Assets:
Beginning balance	68,626	62,691	64,862	55,824
Total gains/losses (realized and unrealized)	1,477	12,133	8,771	23,622
Purchases	17,704	9,848	41,690	30,744
Sales	(1,147)	(648)	(22,797)	(1,062)
Settlements	(1,323)	(17,331)	(5,214)	(43,798)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(3,256)	(9,208)	(5,231)	(7,845)
Ending balance	82,081	57,485	82,081	57,485
For instruments still held, changes in unrealized gains/(losses) included in Earnings	649	(8,000)	4,351	(13,103)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Sovereign obligations
Assets:
Beginning balance	0		0
Total gains/losses (realized and unrealized)	0		(16)
Purchases	0		11,147
Sales	0		(11,025)
Settlements	0		0
Issuances	0		0
Net transfers into/ (out of) Level 3	106		0
Ending balance	106		106
For instruments still held, changes in unrealized gains/(losses) included in Earnings	0		3
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0		0
RMBS
Assets:
Beginning balance	644	24,705	20,871	27,617
Total gains/losses (realized and unrealized)	24	(1,796)	(185)	(4,239)
Purchases	0	324	0	0
Sales	0	0	(5,374)	0
Settlements	(12)	(4)	(63)	(149)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(32)	0	(14,625)	0
Ending balance	624	23,229	624	23,229
For instruments still held, changes in unrealized gains/(losses) included in Earnings	34	(686)	33	(1,513)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
CMBS
Assets:
Beginning balance	477	28,946	508	839
Total gains/losses (realized and unrealized)	15	(535)	(16)	(1,282)
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	0	0	28,854
Ending balance	492	28,411	492	28,411
For instruments still held, changes in unrealized gains/(losses) included in Earnings	0	(368)	(64)	(428)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Liabilities:
Beginning Balance	1,049	630	840	490
Total gains/losses (realized and unrealized)	0	(11)	0	(11)
Purchases	0	0	(245)	0
Sales	0	0	0	0
Settlements	70	210	525	245
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	(105)	(1)	0
Ending Balance	1,119	724	1,119	724
For instruments still held, changes in unrealized gains/(losses) included in Earnings	0	11	(2)	11
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Other ABS
Assets:
Beginning balance	168,736	126,075	117,661	94,677
Total gains/losses (realized and unrealized)	(966)	(2,768)	(7,724)	(9,162)
Purchases	29,502	50,945	94,754	90,507
Sales	(27,528)	(2,534)	(68,622)	(4,387)
Settlements	(3,608)	0	(19,929)	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	(20,733)	5,324	29,263	5,407
Ending balance	145,403	177,042	145,403	177,042
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(1,988)	(3,995)	(5,778)	(11,922)
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	92,546	141,817	130,101	168,875
Total gains/losses (realized and unrealized)	(18,742)	6,776	(43,105)	4,626
Purchases	10,138	7,342	20,220	12,769
Sales	(4,489)	(7,967)	(4,856)	(28,171)
Settlements	(2,258)	0	(19,523)	(186)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	9,929	2,239	4,287	(7,706)
Ending balance	87,124	150,207	87,124	150,207
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(5,863)	7,955	(17,949)	10,380
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	138,057	153,800	130,835	161,992
Total gains/losses (realized and unrealized)	952	114,681	(10,626)	112,094
Purchases	371	575	19,725	7,994
Sales	0	0	0	(2,420)
Settlements	0	(196)	(547)	(10,887)
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	(12,747)	(7)	(12,660)
Ending balance	139,380	256,113	139,380	256,113
For instruments still held, changes in unrealized gains/(losses) included in Earnings	952	114,681	(10,626)	113,807
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Loans
Liabilities:
Beginning Balance	1,584	3,348	1,521	3,164
Total gains/losses (realized and unrealized)	(1,000)	2,522	1,879	(124)
Purchases	0	(1,655)	(180)	(1,655)
Sales	964	247	1,367	354
Settlements	12	0	152	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	2,977	(3,179)	5,700
Ending Balance	1,560	7,439	1,560	7,439
For instruments still held, changes in unrealized gains/(losses) included in Earnings	1	(4,508)	(26)	(908)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Net derivatives
Liabilities:
Beginning Balance	34,877	54,260	50,955	59,524
Total gains/losses (realized and unrealized)	(7,588)	4,259	(17,212)	(8,176)
Purchases	0	(9,406)	(3,236)	(5,300)
Sales	0	22,236	2,471	17,037
Settlements	734	0	(9,504)	(854)
Issuances	0	0	0	10,035
Net transfers into/ (out of) Level 3	477	(31,313)	5,026	(32,230)
Ending Balance	28,500	40,036	28,500	40,036
For instruments still held, changes in unrealized gains/(losses) included in Earnings	4,363	(4,177)	5,659	7,718
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	0	0	0	0
Other secured financings
Liabilities:
Beginning Balance	3,965	1,712	3,898	1,712
Total gains/losses (realized and unrealized)	0	0	4,482	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(4,415)	0
Issuances	0	0	0	0
Net transfers into/ (out of) Level 3	0	0	0	0
Ending Balance	3,965	1,712	3,965	1,712
For instruments still held, changes in unrealized gains/(losses) included in Earnings	0	0	(4,482)	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	784,212	697,057	744,597	661,123
Total gains/losses (realized and unrealized)	25,080	20,768	34,157	40,321
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(2,109)	0
Issuances	542	5,572	28,614	5,775
Net transfers into/ (out of) Level 3	(20,688)	(17,482)	(16,113)	(1,304)
Ending Balance	789,146	705,915	789,146	705,915
For instruments still held, changes in unrealized gains/(losses) included in Earnings	(37,145)	(5,770)	(41,836)	(8,970)
For instruments still held, changes in unrealized gains/(losses) included in Other comprehensive income	$ 12,065	$ (14,998)	$ 7,679	$ (31,351)