Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Nov. 30, 2024	Nov. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investment	$ 1,252,689	$ 1,209,383
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	22,885,585	20,538,090
Counterparty and cash collateral netting, assets	(2,667,751)	(3,107,620)
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	120,414	110,198
Securities received as collateral	185,588	8,800
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	11,007,328	11,251,154
Counterparty and Cash Collateral Netting	(2,793,713)	(2,764,572)
Other secured financings	24,848	3,898
Obligation to return securities received as collateral	185,588	8,800
Long-term debt	2,351,346	1,708,443
Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,779,473	4,224,174
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,087,325	2,318,905
Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,335,746	4,947,334
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,105,175	2,842,900
Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,093,638	934,108
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		36
U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,743,366	3,628,730
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	2,904,405	2,957,787
Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	320,507	223,502
Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,380,765	1,660,946
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	1,089,771	1,809,097
Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	2,356,576	2,069,180
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		463
Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	147,229	345,410
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	1,153	840
Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	213,901	372,709
Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,858,738	1,450,318
Interest rate swaps
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	517,775	550,844
Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	137,871	130,835
Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	109,185	175,349
Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	710,314	1,145,777
Level 1
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	9,571,255	8,446,670
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	120,414	110,198
Securities received as collateral	185,588	8,800
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	6,585,916	6,422,685
Other secured financings	0	0
Obligation to return securities received as collateral	185,588	8,800
Long-term debt	0	0
Level 1 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,238,058	3,831,698
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,013,877	2,235,049
Level 1 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 1 | Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		0
Level 1 | U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,583,139	3,563,164
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	2,904,379	2,957,787
Level 1 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	749,912	1,051,494
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	667,647	1,229,795
Level 1 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		0
Level 1 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 1 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Interest rate swaps
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	146	314
Level 1 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 1 | Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 1 | Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	13	54
Level 2
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	15,247,856	14,518,460
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	0	0
Securities received as collateral	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	7,170,523	7,530,589
Other secured financings	9,964	0
Obligation to return securities received as collateral	0	0
Long-term debt	1,529,443	963,846
Level 2 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	302,051	211,182
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	73,240	83,180
Level 2 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,310,815	4,921,222
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,105,010	2,842,776
Level 2 | Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,029,662	869,246
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		36
Level 2 | U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	160,227	65,566
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	26	0
Level 2 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	320,507	223,502
Level 2 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	630,681	609,452
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	422,124	579,302
Level 2 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	2,348,862	2,048,309
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		463
Level 2 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	146,752	344,902
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 2 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	110,687	255,048
Level 2 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,706,152	1,320,217
Level 2 | Interest rate swaps
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,181,454	3,649,814
Level 2 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	6	0
Level 2 | Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	92,321	173,828
Level 2 | Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	3,477,802	3,851,004
Level 3
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	734,225	680,580
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	0	0
Securities received as collateral	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	44,602	62,452
Other secured financings	14,884	3,898
Obligation to return securities received as collateral	0	0
Long-term debt	821,903	744,597
Level 3 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	239,364	181,294
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	208	676
Level 3 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	24,931	26,112
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	165	124
Level 3 | Collateralized debt obligations and collateralized loan obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	63,976	64,862
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		0
Level 3 | U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 3 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	0	0
Level 3 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	172	0
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	0	0
Level 3 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	7,714	20,871
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value		0
Level 3 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	477	508
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	1,153	840
Level 3 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	103,214	117,661
Level 3 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	152,586	130,101
Level 3 | Interest rate swaps
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,926	8,336
Level 3 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	137,865	130,835
Level 3 | Loans
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	16,864	1,521
Level 3 | Net derivatives
Financial instruments sold, not yet purchased:
Financial instruments sold, not yet purchased, at fair value	26,212	59,291
Fair value based on net asset value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investment	$ 1,250,000	$ 1,210,000