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Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2024
Aug. 31, 2023
Nov. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues $ 1,683,552 $ 1,182,109 $ 5,078,200 $ 3,503,211  
Non-interest expenses 1,430,865 1,091,038 4,377,517 3,236,203  
Non-interest expenses 1,430,900 1,091,100 4,377,500 3,236,200  
Earnings from continuing operations before income taxes 252,687 91,071 700,683 267,008  
Assets 63,275,098   63,275,098   $ 57,905,161
Minimum          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Earnings from continuing operations before income taxes 252,700 91,000 700,700    
Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 1,679,100 1,178,300 5,054,700 3,494,100  
Non-interest expenses 1,430,900 1,091,000 4,377,500 3,236,200  
Earnings from continuing operations before income taxes 248,200 87,300 677,200 257,900  
Segment Reconciling Items          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 4,500 3,700 23,500 9,100  
Non-interest expenses 0 0 0 0  
Earnings from continuing operations before income taxes 4,500 3,700 23,500 9,100  
Investment Banking and Capital Markets          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Assets 57,712,700   57,712,700   51,776,900
Investment Banking and Capital Markets | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 1,620,100 1,168,200 4,565,800 3,446,400  
Non-interest expenses 1,251,600 1,013,100 3,791,000 2,996,200  
Earnings from continuing operations before income taxes 368,500 155,100 774,800 450,200  
Asset Management          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Assets 5,562,400   5,562,400   $ 6,128,300
Asset Management | Operating Segments          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 59,000 10,100 488,900 47,700  
Non-interest expenses 179,300 77,900 586,500 240,000  
Earnings from continuing operations before income taxes $ (120,300) $ (67,800) $ (97,600) $ (192,300)