Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2022
May 31, 2021
May 31, 2022
May 31, 2021
Nov. 30, 2021
Related Party Transaction [Line Items]          
Revenues $ 1,618,147 $ 2,166,329 $ 3,560,947 $ 4,869,917  
Investment banking          
Related Party Transaction [Line Items]          
Revenues 600,859 1,000,700 1,545,907 2,004,312  
Co-sponsored Companies | Investment banking          
Related Party Transaction [Line Items]          
Revenues   10,500   24,000  
Private Equity Related Funds          
Related Party Transaction [Line Items]          
Loans to and/or equity investments in related funds 28,400   28,400   $ 27,100
JCP Fund V          
Related Party Transaction [Line Items]          
Net gains (losses) from private equity related funds 2,300 $ 5,000 3,200 $ 4,500  
Affiliated entity | Berkadia | Jefferies Group          
Related Party Transaction [Line Items]          
Purchase commitment 361,000   361,000   425,600
Affiliated entity | Monashee | Jefferies Group          
Related Party Transaction [Line Items]          
Investment in related party 8,900   8,900   13,600
Affiliated entity | Oak Hill | Jefferies Group          
Related Party Transaction [Line Items]          
Investment in related party 4,400   4,400   6,000
Affiliated entity | FXCM | Jefferies Group | Payables, expense accruals and other liabilities          
Related Party Transaction [Line Items]          
OTC foreign exchange contracts 600   600   700
Officers and employees          
Related Party Transaction [Line Items]          
Loans outstanding to related party $ 20,800   $ 20,800   $ 23,100