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Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 1,455,649 $ 1,144,426
Revenues 2,871,265 2,472,864
Investment banking    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,014,955 725,661
Revenues 1,018,284 729,510
Commissions and other fees    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 361,073 287,965
Revenues 367,604 288,300
Asset management fees    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,899 45,808
Revenues 67,362 85,408
Real estate revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 2,246 11,081
Internet connection and broadband revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 52,412 57,804
Other contracts with customers    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 18,064 16,107
Revenues 117,398 117,245
Principal transactions    
Disaggregation of Revenue [Line Items]    
Revenues not from contracts with customers 487,498 407,230
Revenues 487,498 407,230
Revenues from strategic affiliates    
Disaggregation of Revenue [Line Items]    
Revenues not from contracts with customers 69,292 43,449
Interest    
Disaggregation of Revenue [Line Items]    
Revenues not from contracts with customers 813,119 845,171
Revenues 813,119 845,171
Other    
Disaggregation of Revenue [Line Items]    
Revenues not from contracts with customers $ 45,707 $ 32,588