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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2019
May 31, 2019
Sep. 30, 2018
Aug. 31, 2019
Sep. 30, 2018
Feb. 28, 2019
Nov. 30, 2018
Income Taxes [Line Items]              
Unrecognized tax benefits $ 253,300     $ 253,300     $ 251,400
Interest included in unrecognized tax benefits 60,500     60,500     54,100
Income taxes benefit 36,131   $ (90,391) 522,626 $ (51,560)    
Decrease of deferred tax liabilities 36,000     36,000      
Recognition of accumulated other comprehensive income lodged taxes   $ 544,600   544,583 0    
Lodged tax effect           $ 544,600  
Decrease of income tax provision         $ 43,900    
Jefferies Group              
Income Taxes [Line Items]              
Unrecognized tax benefits $ 180,100     $ 180,100     $ 174,900