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Organization and Basis of Presentation (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2018
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2019
USD ($)
segment
Aug. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Number of reportable segments | segment       2  
Increase of commissions and other fee   $ 586,876 $ 633,210 $ 1,636,618 $ 1,903,938
Reduce of other revenues   22,286 6,420 79,354 58,678
Commissions and Other Fees          
Debt Instrument [Line Items]          
Increase of commissions and other fee   $ 171,003 162,700 $ 493,843 482,194
Reclassified Presentation of Certain Other Fees | Commissions and Other Fees          
Debt Instrument [Line Items]          
Increase of commissions and other fee     7,200   20,600
Reduce of other revenues     $ (7,200)   $ (20,600)
Affiliated Entity | Jefferies          
Debt Instrument [Line Items]          
Proceeds from contributions from parent $ 598,200        
Payment made in related party transaction 76,000        
Related party transaction, related deferred tax liabilities transferred $ 50,900        
Berkadia Commercial Mortgage, LLC          
Debt Instrument [Line Items]          
Ownership percentage 50.00%