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Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
May 31, 2025
May 31, 2024
May 31, 2025
May 31, 2024
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 1,226,804 $ 1,094,401 $ 2,371,230 $ 2,129,032
Revenues 2,494,315 2,516,296 4,967,179 5,068,238
Investment banking        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 785,455 738,584 1,511,116 1,417,649
Revenues 789,269 738,584 1,518,779 1,417,649
Commissions and other fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 344,184 271,782 632,149 517,325
Revenues 353,233 271,782 641,533 517,325
Asset management fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,495 6,989 53,303 36,350
Revenues 20,076 11,768 105,484 62,140
Real estate revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,211 3,540 27,292 6,689
Internet connection and broadband revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 56,668 58,855 114,471 122,269
Internet connection and broadband revenues | Revision of Prior Period, Error Correction, Adjustment        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers   (58,900)   (122,300)
Other contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,791 14,651 32,899 28,750
Revenues 115,205 198,240 232,450 314,977
Principal transactions        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers 338,507 416,195 745,737 1,056,931
Revenues 338,507 416,195 745,737 1,056,931
Revenues from strategic affiliates        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers 21,336 4,779 64,785 25,790
Interest        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers 878,025 879,727 1,723,196 1,699,216
Revenues 878,025 879,727 1,723,196 1,699,216
Other        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers $ 29,643 121,194 $ 62,231 157,269
Other | Revision of Prior Period, Error Correction, Adjustment        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers   $ 58,900   $ 122,300