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Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2024
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 1,504,162 $ 1,283,913 $ 3,875,528 $ 3,412,945
Revenues 2,907,674 2,595,589 7,874,853 7,663,827
Investment banking        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,086,307 925,635 2,597,559 2,343,284
Revenues 1,088,197 927,094 2,606,976 2,344,743
Commissions and other fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 319,784 270,643 951,933 787,968
Revenues 325,178 270,643 966,711 787,968
Asset management fees        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,236 7,189 61,539 43,539
Revenues 13,079 11,986 118,563 74,126
Real estate revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,621 4,038 43,913 10,727
Internet connection and broadband revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 56,598 61,268 171,069 183,537
Internet connection and broadband revenues | Revision of Prior Period, Error Correction, Adjustment        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers   (61,300)   (183,500)
Other contracts with customers        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,616 15,140 49,515 43,890
Revenues 147,433 124,579 379,883 439,556
Principal transactions        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers 486,893 324,501 1,232,630 1,381,432
Revenues 486,893 324,501 1,232,630 1,381,432
Revenues from strategic affiliates        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers 11,933 6,256 76,582 32,046
Interest        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers 846,894 936,786 2,570,090 2,636,002
Revenues 846,894 936,786 2,570,090 2,636,002
Other        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers $ 57,792 44,133 $ 120,023 201,402
Other | Revision of Prior Period, Error Correction, Adjustment        
Disaggregation of Revenue [Line Items]        
Revenues not from contracts with customers   $ 61,300   $ 183,500