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Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Nov. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net revenues $ 7,034,803 $ 4,700,417 $ 5,978,838
Non-interest expenses 6,029,257 4,346,148 4,923,276
Non-interest expenses 6,029,300 4,346,100 4,923,200
Earnings from continuing operations before income tax expense 1,005,546 354,269 1,055,562
Assets 64,360,309 57,905,161  
Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net revenues 7,008,000 4,692,700 5,984,800
Non-interest expenses 6,029,300 4,346,100 4,917,800
Earnings from continuing operations before income tax expense 978,700 346,600 1,067,000
Segment Reconciling Items      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net revenues 26,800 7,700 (6,000)
Non-interest expenses 0 0 5,400
Earnings from continuing operations before income tax expense 26,800 7,700 (11,400)
Investment Banking and Capital Markets      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Assets 59,142,900 51,776,900  
Investment Banking and Capital Markets | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net revenues 6,204,300 4,504,400 4,741,300
Non-interest expenses 5,181,500 3,995,100 3,950,800
Earnings from continuing operations before income tax expense 1,022,800 509,300 790,500
Asset Management      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Assets 5,217,400 6,128,300  
Asset Management | Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net revenues 803,700 188,300 1,243,500
Non-interest expenses 847,800 351,000 967,000
Earnings from continuing operations before income tax expense $ (44,100) $ (162,700) $ 276,500