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Securitization Activities - Summary of Retained Interests in SPEs (Detail) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2015
Nov. 30, 2014
Securitization Vehicles [Line Items]    
Total RMBS securitization assets $ 11,742.9jef_RmbsSecuritizationAssets $ 19,196.9jef_RmbsSecuritizationAssets
Total CMBS securitization assets 3,519.5jef_CmbsSecuritizationAssets 5,848.5jef_CmbsSecuritizationAssets
Total Collateralized loan obligations 4,169.9jef_CollateralizedLoanObligationsSecuritizationAssets 4,511.8jef_CollateralizedLoanObligationsSecuritizationAssets
U.S. government agency residential mortgage-backed securities [Member]    
Securitization Vehicles [Line Items]    
Fair Value of Securitizations Initially Retained 403.7us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= jef_UsGovernmentAgencyIssuedRmbsMember		 226.9us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= jef_UsGovernmentAgencyIssuedRmbsMember
U.S. government agency commercial mortgage-backed securities [Member]    
Securitization Vehicles [Line Items]    
Fair Value of Securitizations Initially Retained 97.9us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= jef_UsGovernmentAgencyIssuedCmbsMember		 204.7us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= jef_UsGovernmentAgencyIssuedCmbsMember
Collateralized loan obligations [Member]    
Securitization Vehicles [Line Items]    
Fair Value of Securitizations Initially Retained $ 53.3us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember		 $ 108.4us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember