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Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2019
Aug. 31, 2018
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 586,876 $ 633,210 $ 1,636,618 $ 1,903,938
Principal transactions 148,873 143,308 632,002 498,583
Interest 383,596 305,347 1,163,022 870,490
Other 22,286 6,420 79,354 58,678
Total revenues 1,141,631 1,088,285 3,510,996 3,331,689
Commissions and other fees        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 171,003 162,700 493,843 482,194
Investment banking        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 412,533 465,326 1,128,216 1,405,614
Asset management fees        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 3,340 $ 5,184 $ 14,559 $ 16,130