Acquisition Common Stock Shares Of Acquired Common Stock

No definition available.

Name:	jef_AcquisitionCommonStockSharesOfAcquiredCommonStock
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Business Acquisition Closing Price Per Share

No definition available.

Name:	jef_BusinessAcquisitionClosingPricePerShare
Namespace Prefix:	jef_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Business Acquisition Common Shares Exchange Ratio

No definition available.

Name:	jef_BusinessAcquisitionCommonSharesExchangeRatio
Namespace Prefix:	jef_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Business Acquisition Cost Of Acquired Entity Convertible Cumulative Preferred Stock

No definition available.

Name:	jef_BusinessAcquisitionCostOfAcquiredEntityConvertibleCumulativePreferredStock
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable Share Based Awards

No definition available.

Name:	jef_BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuableShareBasedAwards
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Business Acquisition Cost Of Acquired Entity Holding Company Equity Interests Issued And Issuable Amount

No definition available.

Name:	jef_BusinessAcquisitionCostOfAcquiredEntityHoldingCompanyEquityInterestsIssuedAndIssuableAmount
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Business Acquisition Equity Restricted Shares For Share Based Payment Award Number Of Shares Issued

No definition available.

Name:	jef_BusinessAcquisitionEquityRestrictedSharesForShareBasedPaymentAwardNumberOfSharesIssued
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Business Acquisition Number Of Common Stock Issued

No definition available.

Name:	jef_BusinessAcquisitionNumberOfCommonStockIssued
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Business Acquisition Purchase Price Allocation Stocks Issued After Adjustments

No definition available.

Name:	jef_BusinessAcquisitionPurchasePriceAllocationStocksIssuedAfterAdjustments
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Business Acquisition Shares Outstanding Prior To Acquisition

No definition available.

Name:	jef_BusinessAcquisitionSharesOutstandingPriorToAcquisition
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Common Stock Shares Owned By Acquiring Entity Outstanding

No definition available.

Name:	jef_CommonStockSharesOwnedByAcquiringEntityOutstanding
Namespace Prefix:	jef_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	jef_LoansAtAcquisitionDateLineItems
Namespace Prefix:	jef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 88-16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(4)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 39

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.