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Commitments, Contingencies and Guarantees - External Credit Ratings of Underlying or Referenced Assets for Credit Related Derivatives Contracts (Detail) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2015
Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings $ 2,772.2jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 76.0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
AAA/Aaa [Member] | Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 2,772.2jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
AAA/Aaa [Member] | Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAAARatingMember
AA/Aa [Member] | Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
AA/Aa [Member] | Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsAARatingMember
A [Member] | Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsARatingMember
A [Member] | Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsARatingMember
BBB/Baa [Member] | Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBRatingMember
BBB/Baa [Member] | Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 12.0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBRatingMember
Below Investment Grade [Member] | Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
Below Investment Grade [Member] | Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 64.0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
Unrated [Member] | Index credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= us-gaap_CreditIndexProductMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= jef_UnratedMember
Unrated [Member] | Single name credit default swaps [Member]  
Commitments And Guarantee Obligations [Line Items]  
External credit ratings $ 0jef_ExternalCreditRatingsForDerivativeContractCredit
/ us-gaap_CreditDerivativesByContractTypeAxis
= jef_SingleNameCreditDefaultSwapsMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= jef_UnratedMember