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Collateralized Transactions - Collateral Pledged (Details) - USD ($)
$ in Thousands
Aug. 31, 2024
Nov. 30, 2023
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements $ 2,550,100 $ 1,840,500
Repurchase Agreements 17,072,800 19,841,200
Obligation to Return Securities Received as Collateral, at Fair Value 272,600 8,800
Total 19,895,500 21,690,500
Corporate equity securities    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 1,570,800 1,221,400
Repurchase Agreements 744,400 627,000
Obligation to Return Securities Received as Collateral, at Fair Value 166,100 4,400
Total 2,481,300 1,852,800
Corporate debt securities    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 919,600 576,400
Repurchase Agreements 3,598,000 4,297,900
Obligation to Return Securities Received as Collateral, at Fair Value 0 0
Total 4,517,600 4,874,300
Mortgage-backed and asset-backed securities    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 0 0
Repurchase Agreements 1,958,200 1,950,900
Obligation to Return Securities Received as Collateral, at Fair Value 0 0
Total 1,958,200 1,950,900
U.S. government and federal agency securities    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 46,700 39,200
Repurchase Agreements 7,084,800 9,474,200
Obligation to Return Securities Received as Collateral, at Fair Value 0 3,400
Total 7,131,500 9,516,800
Municipal securities    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 0 0
Repurchase Agreements 184,900 141,100
Obligation to Return Securities Received as Collateral, at Fair Value 0 0
Total 184,900 141,100
Sovereign obligations    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 13,000 3,500
Repurchase Agreements 2,303,000 2,511,600
Obligation to Return Securities Received as Collateral, at Fair Value 106,500 1,000
Total 2,422,500 2,516,100
Loans and other receivables    
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items]    
Securities Lending Arrangements 0 0
Repurchase Agreements 1,199,500 838,500
Obligation to Return Securities Received as Collateral, at Fair Value 0 0
Total $ 1,199,500 $ 838,500