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Investments - Summary of Selected Financial Information for JCP Funds (Details) (JCP Funds [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
JCP Funds [Member]
    
Schedule of Equity Method Investments [Line Items]    
Total assets $ 73,261us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= jef_JCPFundsMember		  
Total liabilities 66us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= jef_JCPFundsMember		  
Total partners' capital 73,195us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= jef_JCPFundsMember		  
Net decrease in net assets resulting from operations $ (65,700)jef_EquityMethodInvestmentIncreaseDecreaseinAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= jef_JCPFundsMember		 $ (2,947)jef_EquityMethodInvestmentIncreaseDecreaseinAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= jef_JCPFundsMember