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Organization and Basis of Presentation (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Feb. 28, 2015
segment
Feb. 28, 2014
Organization And Basis Of Presentation [Line Items]    
Number of operating segments 2us-gaap_NumberOfOperatingSegments  
Increase (Decrease) in Receivables from customers $ 3.4jef_IncreaseDecreaseInAccountsReceivables $ (26.6)jef_IncreaseDecreaseInAccountsReceivables
Increase (Decrease) in Payables to customers $ (3.4)jef_IncreaseDecreaseInAccountsPayables $ 26.6jef_IncreaseDecreaseInAccountsPayables
3.875% Convertible Senior Debentures due 2029 [Member]    
Organization And Basis Of Presentation [Line Items]    
Convertible Senior Debentures, interest rate 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= jef_ThreePointEightSevenFivePercentageConvertibleSeniorDebenturesDueTwoThousandTwentyNineMember