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Organization and Basis of Presentation (Details)
$ in Thousands
12 Months Ended
Nov. 30, 2019
USD ($)
segment
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Oct. 01, 2018
Organization And Basis Of Presentation [Line Items]        
Number of reportable segments | segment 2      
Increase of commissions and other fee $ 2,222,257 $ 2,594,887    
Reducing of other revenues (93,422) (103,359) $ (74,553)  
Jefferies Financial Group Inc. | Affiliated Entity | Berkadia Commercial Mortgage, LLC        
Organization And Basis Of Presentation [Line Items]        
Ownership percentage       50.00%
Commissions and other fees        
Organization And Basis Of Presentation [Line Items]        
Increase of commissions and other fee $ 676,309 663,465 617,020  
Reclassified Presentation of Certain Other Fees        
Organization And Basis Of Presentation [Line Items]        
Reducing of other revenues   28,300 23,800  
Reclassified Presentation of Certain Other Fees | Commissions and other fees        
Organization And Basis Of Presentation [Line Items]        
Increase of commissions and other fee   $ 28,300 $ 23,800