Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Aug. 31, 2024	Nov. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investment	$ 1,204,380	$ 1,209,383
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	22,834,279	20,538,090
Counterparty and Cash Collateral Netting	(2,270,214)	(3,107,620)
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	68,966	110,198
Securities received as collateral	272,619	8,800
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	12,307,086	11,251,154
Counterparty and Cash Collateral Netting	(2,378,130)	(2,764,572)
Other secured financings	3,965	3,898
Obligation to return securities received as collateral	272,619	8,800
Long-term debt	2,122,890	1,708,443
Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,618,358	4,224,174
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	3,813,044	2,318,905
Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,431,152	4,947,334
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	3,527,010	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	711,036	934,108
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased		36
U.S. government and federal agency securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	3,379,623	3,628,730
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	2,789,472	2,957,787
Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	517,810	223,502
Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,518,725	1,660,946
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	1,436,982	1,809,097
Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	2,505,255	2,069,180
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	26	463
Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	264,773	345,410
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	1,119	840
Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	298,077	372,709
Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,917,569	1,450,318
Derivatives
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	532,515	550,844
Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	139,386	130,835
Loans
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	101,093	175,349
Derivative liabilities
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	638,340	1,145,777
Level 1
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	9,379,399	8,446,670
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	68,966	110,198
Securities received as collateral	272,619	8,800
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	7,423,666	6,422,685
Other secured financings	0	0
Obligation to return securities received as collateral	272,619	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	5,132,729	3,831,698
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	3,720,668	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:
Total financial instruments sold, not yet purchased	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:
Total financial instruments sold, not yet purchased		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	3,292,721	3,563,164
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	2,789,472	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	952,700	1,051,494
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	913,115	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:
Total financial instruments sold, not yet purchased	0	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:
Total financial instruments sold, not yet purchased	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 | Derivatives
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,249	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:
Total financial instruments sold, not yet purchased	0	0
Level 1 | Derivative liabilities
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	411	54
Level 2
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	15,031,740	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:
Total financial instruments sold, not yet purchased	7,220,818	7,530,589
Other secured financings	0	0
Obligation to return securities received as collateral	0	0
Long-term debt	1,333,744	963,846
Level 2 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	284,986	211,182
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	89,406	83,180
Level 2 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	5,399,974	4,921,222
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	3,526,750	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	628,955	869,246
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased		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	86,902	65,566
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	0	0
Level 2 | Municipal securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	517,810	223,502
Level 2 | Sovereign obligations
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	565,919	609,452
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	523,867	579,302
Level 2 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	2,504,631	2,048,309
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	26	463
Level 2 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	264,281	344,902
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	0	0
Level 2 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	152,674	255,048
Level 2 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	1,830,445	1,320,217
Level 2 | Derivatives
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	2,795,157	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:
Total financial instruments sold, not yet purchased	99,533	173,828
Level 2 | Derivative liabilities
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	2,981,236	3,851,004
Level 3
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	693,354	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:
Total financial instruments sold, not yet purchased	40,732	62,452
Other secured financings	3,965	3,898
Obligation to return securities received as collateral	0	0
Long-term debt	789,146	744,597
Level 3 | Corporate equity securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	200,643	181,294
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	2,970	676
Level 3 | Corporate debt securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	31,178	26,112
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	260	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	82,081	64,862
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased		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:
Total financial instruments sold, not yet purchased	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	106	0
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	0	0
Level 3 | Residential mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	624	20,871
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	0	0
Level 3 | Commercial mortgage-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	492	508
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	1,119	840
Level 3 | Other asset-backed securities
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	145,403	117,661
Level 3 | Loans and other receivables
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	87,124	130,101
Level 3 | Derivatives
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	6,323	8,336
Level 3 | Investments at fair value
Financial instruments owned:
Total financial instruments owned, excluding Investments at fair value based on NAV	139,380	130,835
Level 3 | Loans
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	1,560	1,521
Level 3 | Derivative liabilities
Financial instruments sold, not yet purchased:
Total financial instruments sold, not yet purchased	34,823	59,291
Fair value based on net asset value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative investment	$ 1,200,000	$ 1,210,000