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Compensation Plans - Remaining Unamortized Amounts (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining Unamortized Amounts $ 424.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Nonvested Share Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining Unamortized Amounts 70.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= jef_NonvestedShareAwardsMember
Weighted Average Vesting Period (in Years) 1 year 10 months 24 days
Restricted Cash Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining Unamortized Amounts $ 354.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= jef_RestrictedCashAwardsMember
Weighted Average Vesting Period (in Years) 3 years