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Noncontrolling Interests (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Nov. 30, 2014
Noncontrolling Interest [Line Items]    
Noncontrolling interests $ 39,719us-gaap_MinorityInterest $ 38,848us-gaap_MinorityInterest
Global Equity Event Opportunity Fund LLC [Member]    
Noncontrolling Interest [Line Items]    
Noncontrolling interests 34,021us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= jef_GlobalEquityEventOpportunityFundLlcMember		 33,303us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= jef_GlobalEquityEventOpportunityFundLlcMember
Other [Member]    
Noncontrolling Interest [Line Items]    
Noncontrolling interests 5,698us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= jef_OtherConsolidatedEntitiesMember		 5,545us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= jef_OtherConsolidatedEntitiesMember
Leucadia [Member]    
Noncontrolling Interest [Line Items]    
Noncontrolling interests $ 26,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= jef_LeucadiaMember		 $ 25,400us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= jef_LeucadiaMember