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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
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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

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