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Net Capital Requirements - Net Capital, Adjusted and Excess Net Capital (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Jefferies [Member]  
Net Capital Requirements [Line Items]  
Net Capital $ 954,261us-gaap_NetCapital
/ dei_LegalEntityAxis
= jef_JefferiesMember
Excess Net Capital 837,399us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= jef_JefferiesMember
Jefferies Execution [Member]  
Net Capital Requirements [Line Items]  
Net Capital 7,132us-gaap_NetCapital
/ dei_LegalEntityAxis
= jef_JefferiesExecutionMember
Excess Net Capital $ 6,882us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= jef_JefferiesExecutionMember