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Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Footnote) (Detail) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2015
Nov. 30, 2014
Banking and Thrift [Abstract]    
Securities borrowing arrangements $ 5,241.5jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangements $ 4,847.4jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangements
Securities borrowing arrangements, collateral 5,093.8jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangementsCollateral 4,694.0jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangementsCollateral
Securities borrowing arrangements, repurchase agreements 1,038.8jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangementsRepurchaseAgreements 1,201.9jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangementsRepurchaseAgreements
Securities borrowing arrangements, pledged securities collateral $ 1,073.4jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangementsPledgedSecuritiesCollateral $ 1,238.4jef_CollateralizedFinancingTransactionsSecuritiesBorrowingArrangementsPledgedSecuritiesCollateral