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Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
May 31, 2025
Nov. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Alternative investment $ 1,440,253 $ 1,252,689
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 24,129,941 22,885,585
Counterparty and cash collateral netting, assets (2,715,818) (2,667,751)
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations   120,414
Securities received as collateral 50,968 185,588
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 11,775,135 11,007,328
Counterparty and cash collateral netting, liabilities (3,087,478) (2,793,713)
Other secured financings 429,289 24,848
Obligation to return securities received as collateral 50,968 185,588
Long-term debt 3,304,517 2,351,346
Corporate equity securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 5,668,126 5,779,473
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,885,415 3,087,325
Corporate debt securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 5,420,328 5,335,746
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,535,114 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 756,459 1,093,638
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1  
U.S. government and federal agency securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 3,269,479 3,743,366
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 2,136,584 2,904,405
Municipal securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 621,737 320,507
Sovereign obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 1,432,564 1,380,765
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,406,377 1,089,771
Residential mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 2,048,476 2,356,576
Commercial mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 73,068 147,229
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,190 1,153
Other asset-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 732,711 213,901
Loans and other receivables    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 2,665,121 1,858,738
Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 1,288,486 517,775
Investments at fair value    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 153,386 137,871
Loans    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 87,728 109,185
Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 722,726 710,314
Level 1    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 8,853,253 9,571,255
Securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations   120,414
Securities received as collateral 50,968 185,588
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 6,821,306 6,585,916
Other secured financings 0 0
Obligation to return securities received as collateral 50,968 185,588
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 5,018,987 5,238,058
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,870,700 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
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 3,139,294 3,583,139
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 2,136,579 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 694,500 749,912
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 814,027 667,647
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 472 146
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 0 13
Level 2    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 17,229,467 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 7,997,179 7,170,523
Other secured financings 410,413 9,964
Obligation to return securities received as collateral 0 0
Long-term debt 2,313,361 1,529,443
Level 2 | Corporate equity securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 417,979 302,051
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 14,554 73,240
Level 2 | Corporate debt securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 5,375,646 5,310,815
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,534,470 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 685,511 1,029,662
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1  
Level 2 | U.S. government and federal agency securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 130,185 160,227
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 5 26
Level 2 | Municipal securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 621,737 320,507
Level 2 | Sovereign obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 738,064 630,681
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 592,350 422,124
Level 2 | Residential mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 2,040,529 2,348,862
Level 2 | Commercial mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 72,563 146,752
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 37 0
Level 2 | Other asset-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 579,030 110,687
Level 2 | Loans and other receivables    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 2,572,953 1,706,152
Level 2 | Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 3,995,263 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 87,415 92,321
Level 2 | Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 3,768,347 3,477,802
Level 3    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 763,039 734,225
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 44,128 44,602
Other secured financings 18,876 14,884
Obligation to return securities received as collateral 0 0
Long-term debt 991,156 821,903
Level 3 | Corporate equity securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 231,160 239,364
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 161 208
Level 3 | Corporate debt securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 44,682 24,931
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 644 165
Level 3 | Collateralized debt obligations and collateralized loan obligations    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 70,948 63,976
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 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 7,947 7,714
Level 3 | Commercial mortgage-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 505 477
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 1,153 1,153
Level 3 | Other asset-backed securities    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 153,681 103,214
Level 3 | Loans and other receivables    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 92,168 152,586
Level 3 | Derivatives    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 8,569 3,926
Level 3 | Investments at fair value    
Financial instruments owned:    
Total financial instruments owned, excluding Investments at fair value based on NAV 153,379 137,865
Level 3 | Loans    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 313 16,864
Level 3 | Derivatives    
Financial instruments sold, not yet purchased:    
Financial instruments sold, not yet purchased, at fair value 41,857 26,212
Fair Value Based on Net Asset Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Alternative investment $ 1,440,000 $ 1,250,000