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Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Aug. 31, 2025
Nov. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Alternative investment $ 1,499,292 $ 1,252,689
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 24,617,772 22,885,585
Counterparty and cash collateral netting, assets (2,792,740) (2,667,751)
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations   120,414
Securities received as collateral 54,155 185,588
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 12,356,852 11,007,328
Counterparty and cash collateral netting, liabilities (3,151,209) (2,793,713)
Other secured financings 611,903 24,848
Obligation to return securities received as collateral 54,155 185,588
Long-term debt 3,564,534 2,351,346
Corporate equity securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 6,215,712 5,779,473
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 4,476,096 3,087,325
Corporate debt securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 5,121,437 5,335,746
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,274,941 3,105,175
Collateralized debt obligations and collateralized loan obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 664,901 1,093,638
U.S. government and federal agency securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 3,441,251 3,743,366
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,788,901 2,904,405
Municipal securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 518,701 320,507
Sovereign obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 1,740,538 1,380,765
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,488,869 1,089,771
Residential mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 1,450,756 2,356,576
Commercial mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 83,927 147,229
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,189 1,153
Other asset-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 814,754 213,901
Loans and other receivables    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 2,671,803 1,858,738
Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 1,732,485 517,775
Investments at fair value    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 161,507 137,871
Loans    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 73,580 109,185
Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,253,276 710,314
Level 1    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 10,136,074 9,571,255
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations   120,414
Securities received as collateral 54,155 185,588
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 7,057,129 6,585,916
Other secured financings 0 0
Obligation to return securities received as collateral 54,155 185,588
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 5,737,635 5,238,058
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 4,432,279 3,013,877
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
Level 1 | U.S. government and federal agency securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 3,354,090 3,583,139
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,788,871 2,904,379
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 1,043,729 749,912
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 835,790 667,647
Level 1 | Residential mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 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:    
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 | Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 620 146
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 | Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 189 13
Level 2    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 16,471,572 15,247,856
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations   0
Securities received as collateral 0 0
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 8,401,811 7,170,523
Other secured financings 595,789 9,964
Obligation to return securities received as collateral 0 0
Long-term debt 2,493,370 1,529,443
Level 2 | Corporate equity securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 205,768 302,051
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 43,021 73,240
Level 2 | Corporate debt securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 5,087,057 5,310,815
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,274,453 3,105,010
Level 2 | Collateralized debt obligations and collateralized loan obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 612,592 1,029,662
Level 2 | U.S. government and federal agency securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 87,161 160,227
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 30 26
Level 2 | Municipal securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 518,701 320,507
Level 2 | Sovereign obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 696,809 630,681
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 653,079 422,124
Level 2 | Residential mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 1,442,778 2,348,862
Level 2 | Commercial mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 83,421 146,752
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1 0
Level 2 | Other asset-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 688,579 110,687
Level 2 | Loans and other receivables    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 2,531,881 1,706,152
Level 2 | Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 4,516,818 3,181,454
Level 2 | Investments at fair value    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 7 6
Level 2 | Loans    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 71,614 92,321
Level 2 | Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 4,359,613 3,477,802
Level 3    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 802,866 734,225
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations   0
Securities received as collateral 0 0
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 49,121 44,602
Other secured financings 16,114 14,884
Obligation to return securities received as collateral 0 0
Long-term debt 1,071,164 821,903
Level 3 | Corporate equity securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 272,309 239,364
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 796 208
Level 3 | Corporate debt securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 34,380 24,931
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 488 165
Level 3 | Collateralized debt obligations and collateralized loan obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 52,309 63,976
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 0 172
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 7,978 7,714
Level 3 | Commercial mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 506 477
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,188 1,153
Level 3 | Other asset-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 126,175 103,214
Level 3 | Loans and other receivables    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 139,922 152,586
Level 3 | Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 7,787 3,926
Level 3 | Investments at fair value    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 161,500 137,865
Level 3 | Loans    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,966 16,864
Level 3 | Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 44,683 26,212
Fair value based on net asset value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Alternative investment $ 1,500,000 $ 1,250,000