Segment Information - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2021
Dec. 01, 2021
Segment Reporting Information [Line Items]          
Interest expense $ 9,311 $ 19,943 $ 18,399 $ 40,310  
Reportable Segments | Merchant Banking and Asset Management Segments          
Segment Reporting Information [Line Items]          
Net assets         $ 477,000
Reportable Segments | Merchant Banking          
Segment Reporting Information [Line Items]          
Net assets         194,000
Interest expense 900 800 1,600 1,800  
Reportable Segments | Investment Banking and Capital Markets          
Segment Reporting Information [Line Items]          
Net assets         139,000
Interest expense   5,300   10,800  
Reportable Segments | Investment Banking and Capital Markets | Foursight          
Segment Reporting Information [Line Items]          
Net assets         48,000
Reportable Segments | Asset Management          
Segment Reporting Information [Line Items]          
Net assets         $ 55,000
Reconciling items - Parent Company interest          
Segment Reporting Information [Line Items]          
Interest expense $ 8,400 $ 13,800 $ 16,800 $ 27,700