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Investments - FXCM - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2022
Nov. 30, 2021
Schedule of Equity Method Investments [Line Items]    
Brokers, dealers and clearing organizations $ 2,628,727 $ 3,952,093 [1]
Investment in FXCM    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00%  
Senior secured term loans at fair value $ 35,100 50,500
Weighted average life of assets and liabilities 11 years  
Brokers, dealers and clearing organizations $ 500 $ 700
Investment, other than temporary impairment $ 25,300  
[1] See Note 1 for a description of financial statement presentation changes made as a result of our Merger with Jefferies Group.