Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Hotel Hotel [Member] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Equity options and forwards Equity Forwards Swaps And Options [Member] Equity Forward, Swaps And Options [Member] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Other investment vehicles Other Investment Vehicles [Member] Other Investment Vehicles [Member] Weighted-average interest rate Debt, Weighted Average Interest Rate Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Greater Than 5 Years Otc Derivative Liabilities Having Maturity Period Of Greater Than Five Years OTC derivative liabilities having maturity period of greater than 5 years. Adjustment to Compensation, Amount Adjustment to Compensation Amount Service fees Service Fees Earned Service Fees Earned Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Pledged Status [Axis] Pledged Status [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Percent of weighted average common shares outstanding Antidilutive Securities Excluded From Computation Of Earnings Per Share, Percent Of Weighted Average Common Shares Outstanding Antidilutive Securities Excluded From Computation Of Earnings Per Share, Percent Of Weighted Average Common Shares Outstanding Segment Reporting [Abstract] Segment Reporting [Abstract] Securities borrowing arrangements Collateralized Financing Transactions Securities Borrowing Arrangements Collateralized Financing Transactions Securities Borrowing Arrangements Schedule of Future Amortization Expense Related to Intangible Assets Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Loan commitments outstanding to clients Loan Commitments Outstanding Loan commitments outstanding to clients. Other Other VIEs [Member] Other VIEs Other assets Disposal Group, Including Discontinued Operation, Other Assets Notional/ Maximum Payout Guarantor Obligations, Maximum Exposure, Undiscounted Receivables related to revenue from contracts with customers Contract with Customer, Asset, after Allowance for Credit Loss Derivative Instrument [Axis] Derivative Instrument [Axis] Proceeds from assets held for sale Proceeds from Divestiture of Businesses Total OTC derivative liabilities, net of cross-maturity netting Consolidated Otc Derivative Liabilities Net Of Cross Maturity Netting Total OTC derivative liabilities, net of cross-maturity netting. U.S. government and federal agency securities US Treasury and Government [Member] Reclassification to held for sale / Write-off related to disposals Goodwill, Divestiture Greater Than 5 Years Otc Derivative Assets Having Maturity Period Of Greater Than Five Years OTC derivative assets having maturity period of greater than five years. Consolidated Entities [Axis] Consolidated Entities [Axis] Surety policy issued Surety Policy Issued Surety Policy Issued Other revenues not allocated to segments Revenue Not from Contract with Customer, Other Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Financial instruments sold, not yet purchased, measurement input Financial Instruments Sold, Not Yet Purchased, Measurement Input Financial Instruments Sold, Not Yet Purchased, Measurement Input Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Assets held for sale: Disposal Group, Including Discontinued Operation, Assets [Abstract] Reclassification [Table] Reclassification [Table] Loans, face amount Loan Receivable, Face Amount Loan Receivable, Face Amount Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Total committed equity capitalization of JFIN Commitments Under Equity Capitalization Of Joint Venture Entity Commitments under equity capitalization of joint venture entity. JCP Entities JCP Entities [Member] JCP Entities [Member] Schedule of Net Capital, Adjusted and Excess Net Capital Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Related Party Transactions Related Party Transactions Disclosure [Text Block] Consolidated Entities [Domain] Consolidated Entities [Domain] Payments on distributions to noncontrolling interests Payments to Noncontrolling Interests Common shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Revenues from strategic affiliates Strategic Affiliates Revenue [Member] Strategic Affiliates Revenue Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Customers Increase Decrease In Customers Receivable The net change during the reporting period of the amounts due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Total net carrying amount - intangible assets Intangible Asset, Excluding Goodwill, after Accumulated Amortization Available collateral Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Foreign Currency Borrowing Foreign Currency Borrowing [Member] Foreign Currency Borrowing 2028 and 2029 Contractual Obligation, to be Paid, Year Two and Three Customer relationships Customer Relationships [Member] Payables: Payables: Payables [Abstract] Payables. Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Address, City or Town Entity Address, City or Town Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Receivables: Receivables: Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] ROTE threshold level Share-Based Compensation Arrangement By Share-Based Payment Award, Return On Tangible Equity, Threshold Level Share-Based Compensation Arrangement By Share-Based Payment Award, Return On Tangible Equity, Threshold Level Total Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement Net carrying amount - finite lived intangible assets Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Loans and other receivables Fair Value, Option, Credit Risk, Gains (Losses) on Assets Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Arcadia Leasing II LLC Arcadia Leasing II LLC [Member] Arcadia Leasing II LLC Total other comprehensive income (loss), net of tax Other comprehensive (loss) income, net of taxes Recognized in OCI Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Other expenses Other expenses Other Expenses Subsequent Event Type [Axis] Subsequent Event Type [Axis] Cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Dividends paid on participating securities Distributed Earnings Financial instruments owned, measurement input Financial Instruments, Owned, Measurement Input Financial Instruments, Owned, Measurement Input Loans and other receivables Loans and other receivables Loans and Finance Receivables [Member] Non-voting Common Stock Nonvoting Common Stock [Member] Internet connection and broadband revenues Internet Connection And Boadband Revenue [Member] Internet Connection And Boadband Revenue Transfers of liabilities from Level 2 to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 Schedule of Net Revenues, Expenses and Total Assets by Segment Segment Reporting [Table Text Block] Municipal securities Municipal Bonds [Member] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Table] Related Party [Axis] Related and Nonrelated Parties [Axis] Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] 60 Days Prior Written Notice 60 Days Prior Written Notice [Member] 60 Days Prior Written Notice [Member] Document Period End Date Document Period End Date Subsidiaries Subsidiaries [Member] Discontinued Operations, Held-for-Sale Discontinued Operations, Held-for-Sale [Member] Preferred shares, outstanding (in shares) Preferred Stock, Shares Outstanding Paydown on a credit facility Debt Instrument, Face Amount Earnings per common share: Earnings Per Share, Basic [Abstract] Netting in Consolidated Statements of Financial Condition Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Liability Offset HomeFed LLC HomeFed LLC [Member] HomeFed LLC - Member VIE Assets Variable Interest Entity Carrying Amount Of Assets Non Consolidated Vie Variable Interest Entity Carrying Amount Of Assets Non Consolidated Vie Proceeds from contributions of noncontrolling interests Proceeds from Noncontrolling Interests Consolidation, Eliminations Consolidation, Eliminations [Member] Underwriting costs Underwriting Costs Underwriting Costs Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] CLO placement and structuring fee revenues Brokerage Commissions Revenue Schedule of Activity Related to Securitizations Accounted for as Sales Summary Of Securitization Arrangements Activity [Table Text Block] Tabular disclosure of the amount of financial assets securitized, proceeds and net revenues and cash flows received from retained interests. Securities sold under agreements to repurchase Net Amounts in Consolidated Statements of Financial Condition Securities sold under agreements to repurchase Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Total gains/(losses) (realized and unrealized) Total losses (realized and unrealized) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Schedule of Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Other Other Sources Of Revenue, Miscellaneous [Member] Other Sources Of Revenue, Miscellaneous Trademarks and trade names Trademarks and Trade Names [Member] Earnings per common share Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net change in bank overdrafts Proceeds from (Repayments of) Bank Overdrafts Total liabilities Liabilities Total liabilities Total liabilities Liabilities Trading Symbol Trading Symbol Discount rate/yield Measurement Input, Discount Rate [Member] Related party private equity vehicles Private Equity Vehicles [Member] Private equity vehicles. Transfers of liabilities from Level 3 to Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 Financial instruments sold, not yet purchased: Financial instruments sold, not yet purchased and Long-term debt Financial Instruments Sold, Not yet Purchased, at Fair Value [Abstract] Net payments on premises and equipment Payments to Acquire Property, Plant, and Equipment Securitization Activity Secured Funding Vehicles Securitization Activity [Member] Securitization Activity [Member] Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Basis points upfront Measurement Input, Basis Points Upfront [Member] Measurement Input, Basis Points [Member] U.S. government and federal agency securities US Government Corporations and Agencies Securities [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Total RMBS securitization assets Rmbs Securitization Assets Represents unpaid principal amount of assets in residential mortgage backed securitization vehicles at the balance sheet date. Credit Facility [Domain] Credit Facility [Domain] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Common stock, dividends, cash paid (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Preferred stock, maximum shares (in shares) Exchange Agreement, Number Of Preferred Stock, Maximum Exchange Agreement, Number Of Preferred Stock, Maximum Disposal Group Name [Domain] Disposal Group Name [Domain] Transfers of assets from Level 3 to Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Credit Loss [Abstract] Numerator Numerator For Earnings Per Share, Diluted [Abstract] Numerator For Earnings Per Share, Diluted Schedule of Assets and Liabilities Classified as Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Bilateral OTC Bilateral Otc [Member] Bilateral OTC [Member] Obligation to Return Securities Received as Collateral, at Fair Value Obligation to return securities received as collateral, at fair value Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Fixed rate callable notes Fixed Rate, Callable Note [Member] Fixed Rate, Callable Note Other Other Intangible Assets [Member] Return of and additional collateral required in the event of a credit rating downgrade below investment grade Additional Collateral Required In The Event Of Credit Rating Downgrade, Aggregate Fair Value Additional Collateral Required In The Event Of Credit Rating Downgrade, Aggregate Fair Value Premises and equipment, net Disposal Group, Including Discontinued Operation, Premises And Equipment, Net Disposal Group, Including Discontinued Operation, Premises And Equipment, Net Placement and referral fee revenues Investment Fund Placement And Referral Fee Revenue Investment Fund Placement And Referral Fee Revenue Award Timing Predetermined Award Timing Predetermined [Flag] Income tax credits and other income tax benefits Tax Credits And Other Income Tax Benefits Tax Credits And Other Income Tax Benefits Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Denominator Denominator For Earning For Share, Diluted [Abstract] Denominator For Earning For Share, Diluted Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Dilutive effect of share-based payment arrangements (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Reclassification [Line Items] Reclassification [Line Items] Net earnings Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Weighted average common shares outstanding (in shares) Weighted Average Common Shares Outstanding Weighted Average Common Shares Outstanding Mortgage-backed and asset-backed securities Mortgage and Asset-Backed Securities [Member] Mortgage and Asset-Backed Securities [Member] Originations and purchases of loans, notes and other receivables Payments For Origination And Purchase Of Loans, Notes, And Other Receivables Payments For Origination And Purchase Of Loans, Notes, And Other Receivables Lease liabilities Increase (Decrease) in Operating Lease Liability Restricted stock with future service required Restricted Stock With Future Service Required [Member] Restricted Stock With Future Service Required [Member] Residential mortgage-backed securities RMBS Residential Mortgage-Backed Securities [Member] Preferred shares, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Long term debt, at fair value Long-term debt Fair value Long-Term Debt, Fair Value Weighted average shares of participating securities (in shares) Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights Plan Name [Domain] Plan Name [Domain] JFSI - CFTC Jefferies Financial Services, Inc CFTC [Member] Jefferies Financial Services, Inc CFTC Scenario [Domain] Scenario [Domain] Notional amount Derivative Assets (Liabilities), Notional Amount Derivative Assets (Liabilities), Notional Amount Collateral received Collateral Received, Aggregate Fair Value Collateral Received, Aggregate Fair Value Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 5.875% Senior Notes Due 2028 Five Point Eight Seven Five Percentage Senior Notes, Due 2028 [Member] Five Point Eight Seven Five Percentage Senior Notes, Due 2028 Fixed income Fixed Income Segment [Member] Fixed Income Segment Dividends paid to common and preferred shareholders Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Hedging Relationship [Axis] Hedging Relationship [Axis] Aggregate amount of infrastructure improvement bonds, outstanding Aggregate Amount Of Infrastructure Improvement Bonds Outstanding Aggregate Amount Of Infrastructure Improvement Bonds Outstanding Americas Americas [Member] Total equity Balance, beginning of period Balance, end of period Total members’ equity Total accumulated other comprehensive loss, net of tax Equity, Including Portion Attributable to Noncontrolling Interest Sovereign obligations Sovereign Debt Securities [Member] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Derivative asset, measurement input Derivative Asset, Measurement Input Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Exchange-traded Exchange Traded Options [Member] Constant default rate Measurement Input, Default Rate [Member] JCP Fund V JCP Funds [Member] JCP Funds [Member] Loans and other receivables Fair Value, Option, Aggregate Differences, Loans and Long-Term Receivables Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Remaining Unamortized Amounts Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Percentage of not redeemable investments Not Redeemable Investments Not Redeemable Investments 2027 Guarantees Expected To Be Due, Year One Guarantees Expected To Be Due, Year One Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Segments [Domain] Segments [Domain] Jefferies Capital Partners LLC Jefferies Capital Partners Llc [Member] Jefferies capital partners, LLC. Interest rate swaps Interest Rate Swap [Member] Borrowings Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Maximum Payout Contractual Obligation BB+ or lower Fair Value Of Over Counter Derivatives Assets Counterparty Credit Quality Bb or Lower Fair value of OTC derivatives assets, counterparty credit quality BB or lower. Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held Fair Value, Assets Measured On Recurring Basis, Change In Unrealized Gain (Loss) Included In Other Comprehensive Income Fair Value, Assets Measured On Recurring Basis, Change In Unrealized Gain (Loss) Included In Other Comprehensive Income Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Commitments and Contingencies Contractual Obligation, Fiscal Year Maturity [Table Text Block] Collateralized Transactions Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] 90 Days Prior Written Notice 90 Days Prior Written Notice [Member] 90 Days Prior Written Notice Unfunded portion of equity commitment to subsidiary Equity Commitment To Joint Venture Unfunded Portion Equity commitment to joint venture unfunded portion. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Other secured financings Other Secured Financings At Fair Value [Member] Other Secured Financings At Fair Value [Member] Outstanding Loan Commitments to Clients Outstanding Loan Commitments To Clients [Member] Outstanding Loan Commitments To Clients Payment to acquire investment Payments to Acquire Equity Method Investments Total Jefferies Financial Group Inc. shareholders' equity Equity, Attributable to Parent Equities Equities [Member] Equities [Member] Non-cash investing activities related to donated land with a fair market value Non-Cash Investing Activities Related To Donated Land With Fair Market Value Non-Cash Investing Activities Related To Donated Land With Fair Market Value Real Estate [Domain] Real Estate [Domain] Assets Assets Assets [Abstract] Brokers, dealers and clearing organizations Receivables from brokers Brokers, dealers and clearing organizations Receivable from Broker-Dealer and Clearing Organization Professional services Professional Fees Insider Trading Policies and Procedures [Line Items] Measurement period adjustments Goodwill, Measurement Period Adjustment Net change included within AOCI AOCI Including Portion Attributable to Noncontrolling Interest, Period Increase (Decrease) Gross Amounts Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, before Offset Dividend equivalents Adjustments To Additional Paid In Capital, Dividend Equivalents Adjustments To Additional Paid In Capital, Dividend Equivalents Performance Shares Performance Shares [Member] Purchase commitment amount Purchase Commitment Amount Purchase Commitment Amount Liabilities: Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Loans and other receivables on nonaccrual status and/or 90 days or greater past due Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status, Aggregated Difference Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items] Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items] Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items] Number of operating segments Number of Operating Segments Goodwill Goodwill [Table Text Block] Fees, interest and other Fees, interest and other Fees Interest And Other Represents accounts receivable from clients, counterparties and others, interest income receivable, dividend income receivable, fees receivable, and other receivables from suppliers, insurance companies and amounts due from third parties. Goodwill Goodwill, Gross Entity Central Index Key Entity Central Index Key Index credit default swaps Credit Index Product [Member] Additional paid-in capital Additional Paid in Capital, Common Stock Guarantor Obligation [Table] Guarantor Obligation [Table] Equity Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net losses attributable to noncontrolling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2030 and 2031 Contractual Obligation, to be Paid, Year Four and Five 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Other Stockholders' Equity, Other Liabilities held for sale Total liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Derivatives designated as accounting hedges: Designated as Hedging Instrument [Member] Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Customers Broker-Dealer, Payable to Customer Percentage of profits received from joint venture Percentage Of Profits Received From Joint Venture Percentage Of Profits Received From Joint Venture Investments in and loans to related parties Disposal Group, Including Discontinued Operation, Income (Loss) On Loans To And Investments In Related Parties Disposal Group, Including Discontinued Operation, Income (Loss) On Loans To And Investments In Related Parties Extension period Line Of Credit Extension Period Line of credit extension period. Non-cash investing activities related to exchange of real estate Non-Cash Investing Activities Related To Exchange Of Real Estate Non-Cash Investing Activities Related To Exchange Of Real Estate Repurchase obligation settlement period Repos Obligation Settlement Period Repos Obligation Settlement Period Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Accumulated other comprehensive loss, net of tax Total accumulated other comprehensive loss, net of tax AOCI Attributable to Parent [Member] Derivative contracts—non-credit related Derivative Contracts Non Credit Related [Member] Derivative contracts - non credit related. All Individuals All Individuals [Member] Schedule of Net Revenues by Geographic Region Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Denominator for earnings per common share: Denominator For Earnings Loss Per Share [Abstract] Denominator For Earnings Loss Per Share [Abstract] Assets: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Weighted Average Vesting Period (in Years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Net Capital Requirements [Line Items] Net Capital Requirements [Line Items] Net Capital Requirements [Line Items] Long-term debt, measurement input Long-Term Debt, Measurement Input Securities loaned Net Amounts in Consolidated Statements of Financial Condition Securities loaned Securities Loaned Statement [Line Items] Statement [Line Items] Total assets Assets Total assets Total assets Assets Common stock, number of classes of stock authorized Common Stock, Number Of Classes Of Stock Authorized Common Stock, Number Of Classes Of Stock Authorized Private Equity Funds Private Equity Funds [Member] Interest expense Interest expense Interest Expense, Operating Less: Net losses attributable to noncontrolling interests Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Total OTC derivative assets, net of cross-maturity netting Consolidated Otc Derivative Assets, Net Of Cross-Maturity Netting Total OTC derivative assets, net of cross-maturity netting. Nonconsolidated VIEs Variable Interest Entity, Not Primary Beneficiary [Member] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Carrying amount of equity investment Carrying Amount Of Equity Investments Carrying amount of equity investments. Operating Segments Operating Segments [Member] Equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Compensation Plans Share-Based Payment Arrangement [Text Block] Value of liability excluded from significant unobservable inputs Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Exclusion Value Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Exclusion Value 2026 Contractual Obligation, to be Paid, Remainder of Fiscal Year Occupancy and equipment rental Occupancy, Net PEO PEO [Member] 2032 and Later Contractual Obligation, to be Paid, after Year Five 2028 Long-Term Debt, Maturity, Year Two Credit Losses on Financial Assets Measured at Amortized Cost Credit Loss, Financial Instrument [Text Block] Loss on assets held for sale Gain Loss On Asset, Held-for-Sale Gain Loss On Asset, Held-for-Sale Securities borrowing arrangements Securities Borrowed [Abstract] Commodity swaps, options and forwards Commodity Swaps Options And Forwards [Member] Commodity swaps options and forwards. Restricted stock units with future service required Restricted Stock Units With Future Service Required [Member] Restricted Stock Units With Future Service Required [Member] Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Interest income Interest Income, Financing Receivable, before Allowance for Credit Loss Brooklyn Renaissance Plaza Office Brooklyn Renaissance Plaza Office [Member] Brooklyn Renaissance Plaza Office Retained earnings Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Number of contracts, liabilities Derivative Liability, Number of Instruments Held Net losses attributable to noncontrolling interests Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common shares, outstanding after deducting shares held in treasury (in shares) Common shares, outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Net currency translation adjustments and other Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Repurchase agreements Offsetting Securities Sold under Agreements to Repurchase [Abstract] Corporate debt securities Corporate debt securities Corporate Debt Securities [Member] Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Available collateral Securities Purchased under Agreements to Resell, Fair Value of Collateral Aggregate amortization expense Intangible Asset, Finite-Lived, Amortization Expense Asset management fees and revenues Asset management fees Asset Management [Member] Schedule of Offsetting Assets Offsetting Assets [Table Text Block] Assets Acquired - finite-lived intangible assets Intangible Asset, Finite-Lived, Acquired Brokers and Dealers [Abstract] Broker-Dealer [Abstract] Add: Conversion of preferred shares to non-voting common shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Revenues from contracts with customers Total revenues for reportable segments Revenue from Contract with Customer, Excluding Assessed Tax Securities borrowed Increase (Decrease) in Securities Borrowed Schedule of Selected Financial Information related to Equity Method Investment Equity Method Investments [Table Text Block] Stock repurchased Stock Repurchased During Period, Value Committed line of credit facility amount Line Of Credit Facility Commitment Under Joint Venture Line of credit facility commitment under joint venture. Other asset-backed securities Other ABS Other Asset Backed Securities [Member] Other asset-backed securities. Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Change in cash, cash equivalents, and restricted cash reclassified from (to) assets held for sale Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect, Discontinued Operation Total gross costs - intangible assets Intangible Asset, Excluding Goodwill, before Accumulated Amortization Expected period for the liquidation of the underlying assets, maximum Expected Period For Liquidation Of Underlying Assets Maximum Expected Period For Liquidation Of Underlying Assets Maximum Excess Net Capital Broker-Dealer, Excess Net Capital, Alternative Standard Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Schedule Of Commitments And Guarantee Obligations [Table] Schedule Of Commitments And Guarantee Obligations [Table] Schedule Of Commitments And Guarantee Obligations. Variable Interest Entity, Assets, Eliminated In Consolidation Variable Interest Entity, Assets, Eliminated In Consolidation [Member] Variable Interest Entity, Assets, Eliminated In Consolidation Lease term Lessor, Operating Lease, Term of Contract Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Sovereign obligations Sovereign Debt [Member] Equity Method Investment [Table] Equity Method Investment [Table] Sale of Stock [Axis] Sale of Stock [Axis] 120 Days Prior Written Notice 120 Days Prior Written Notice [Member] 120 Days Prior Written Notice Total earnings for reportable segments Operating Income (Loss) Schedule of Dividends Declared Dividends Declared [Table Text Block] Non-agency mortgage and other asset-backed securities Mortgage And Asset Backed Securitization Activity Non Agency [Member] Mortgage and asset backed securitization activity non agency. Securities loaned Increase (Decrease) in Securities Loaned Transactions Net earnings attributable to Jefferies Financial Group Inc. Net Income (Loss) Available To Common Stockholders Net Income (Loss) Available To Common Stockholders Net amount Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, after Offset Exchange traded derivative assets, with fair value Exchange Traded Derivative Assets Fair value of exchange traded derivative assets. Non-exchange-traded securities Non Exchange Traded Securities [Member] Non-exchange traded securities. Equity options Equity Option [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Securities sold under agreements to repurchase Increase (Decrease) in Payables under Repurchase Agreements Corporate equity securities Corporate equity securities Equity Securities [Member] Secured Credit Facility Secured Credit Facility [Member] Secured Credit Facility Currency losses on foreign currency borrowings Conversion Gains and Losses on Foreign Investments Impairment of assets Asset, Impairment Loss Common shares, issued after deducting shares held in treasury (in shares) Common shares, issued (in shares) Common Stock, Shares, Issued Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule of Guarantees Schedule of Guarantor Obligations [Table Text Block] Gross Amounts Security Borrowed, Subject to Master Netting Arrangement, before Offset Increase of long-term debt Debt Instrument, Increase (Decrease), Net Investment Redemption Prior Written Notice Period [Axis] Investment Redemption Prior Written Notice Period [Axis] Investment Redemption Prior Written Notice Period [Axis] 4.850% Senior Notes Due 2027 Four Point Eight Five Percentage Senior Notes, Due 2027 [Member] Four Point Eight Five Percentage Senior Notes, Due 2027 [Member] Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Net amount Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, after Offset and Deduction Profit sharing plan Profit Sharing Plan [Member] Profit Sharing Plan [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Securities borrowing arrangements, collateral Collateralized Financing Transactions Securities Borrowing Arrangements Collateral Collateralized Financing Transactions Securities Borrowing Arrangements Securities Collateral Received Long-term debt Long-Term Debt [Member] Non-interest expenses Noninterest Expense [Abstract] Number of directors and officers with investments Related Party Transactions, Number Of Directors And Officers With Investments In And Advance To Affiliates, Subsidiaries, Associates, and Joint Ventures Related Party Transactions, Number Of Directors And Officers With Investments In And Advance To Affiliates, Subsidiaries, Associates, and Joint Ventures Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Securities purchased under agreements to resell Increase (Decrease) in Receivables under Repurchase Agreements Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Asset Management Asset Management Asset Management Asset Management Segment [Member] Asset Management Segment [Member] Discounted Cash Flows, Market Approach, Scenario Analysis Valuation Technique, Discounted Cash Flows , Market Approach, and Scenario Analysis [Member] Valuation Technique, Discounted Cash Flows , Market Approach, and Scenario Analysis Changes in unrealized gains/ (losses) included in earnings for instruments still held Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Credit Funds Credit Funds [Member] Credit Funds Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Long-term debt Disposal Group, Including Discontinued Operation, Long Term Debt Disposal Group, Including Discontinued Operation, Long Term Debt Assets and Liabilities Held for Sale Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cash collateral received Cash Collateral Received Cash collateral received that was netted against OTC derivative assets. Additional amounts available for setoff Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Premises and equipment Property, Plant, And Equipment And Operating Lease Right-of-Use Asset, After Accumulated Depreciation And Amortization Property, Plant, And Equipment And Operating Lease Right-of-Use Asset, After Accumulated Depreciation And Amortization Net transfers into/ (out of) Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Currency translation adjustments and other, tax expenses Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Fair Value as of Grant Date Award Grant Date Fair Value Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Schedule of Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share repurchase program, remaining authorized, amount Share Repurchase Program, Remaining Authorized, Amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Commitments And Guarantee Obligations [Line Items] Commitments And Guarantee Obligations [Line Items] Commitments and guarantee obligations. Loans and other receivables on nonaccrual status and/or 90 days or greater past due Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due Cumulative loss rate Measurement Input, Cumulative Loss Rate [Member] Measurement Input, Cumulative Loss Rate [Member] Jefferies GmbH Jefferies GmbH [Member] Jefferies GmbH Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Jefferies Finance Jefferies Finance LLC [Member] Jefferies Finance LLC. Cleared OTC Otc Cleared [Member] OTC Cleared [Member] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Additional amounts available for setoff Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Gross costs - finite lived intangible assets Intangible Asset, Finite-Lived, before Accumulated Amortization Revenues Revenues Revenues Net increase (decrease) in net assets resulting from operations Net increase in members’ equity resulting from operations Equity Method Investment, Increase (Decrease) In Net Assets Resulting from Operations Equity Method Investment, Increase (Decrease) In Net Assets Resulting from Operations Total equity method pickup earnings (losses) recognized in Other revenues Income (Loss) from Equity Method Investments Alternative investment Alternative Investment Accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Strategic Affiliates Strategic Affiliates [Member] Strategic Affiliates Other secured financings Secured Debt, Other Payables: Increase (Decrease) in Operating Liabilities [Abstract] Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Schedule of Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Net proceeds from (payments on) other secured financings Net Proceeds From (Payments On) Other Secured Financings Net Proceeds From (Payments On) Other Secured Financings Equity Award [Domain] Award Type [Domain] U.S. government agency RMBS Us Government Agency Issued Rmbs [Member] Us Government Agency Issued Rmbs [Member] Allocation of undistributed earnings Undistributed Earnings (Loss) from Continuing Operations Available to Common Shareholders, Basic Derivative instrument liabilities with credit-risk-related contingent features Derivative, Net Liability Position, Aggregate Fair Value Fair Value Disclosures Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Asset Pledged as Collateral Asset Pledged as Collateral [Member] Year ending November 30, 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Share price (in dollars per share) Share Price Geographical [Axis] Geographical [Axis] Segregated cash Restricted Cash Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Table [Table Text Block] Reconciliation of beginning Level 3 assets and liabilities to ending Level 3 assets and liabilities (specifically disaggregating purchases, sales, settlements, issuances, transfers to Level 3 and transfers out of Level 3). Fair value based on net asset value Fair Value Measured at Net Asset Value Per Share [Member] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Other assets (includes assets pledged of $675,462 and $627,259) Other assets Other Assets Gains (losses) on net investment hedges recognized in other comprehensive income (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Legal Entity [Axis] Legal Entity [Axis] Up to 30 Days Maturity Less than 30 Days [Member] Liability Class [Axis] Liability Class [Axis] Repurchase agreements Collateralized Financing Transactions, Repurchase Agreements Collateralized Financing Transactions, Repurchase Agreements Distributions received on investments in related parties Distributions Received On Investments In Related Parties Distributions Received On Investments In Related Parties Purchase of common shares for treasury Treasury Stock, Value, Acquired, Cost Method Voting Common Stock Voting Common Stock [Member] Voting Common Stock Cash, cash equivalents, and restricted cash at beginning of period Cash, cash equivalents, and restricted cash at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Net Capital Broker-Dealer, Net Capital Consumer and other loans Other Securitization Assets Other Securitization Assets Long-term debt Fair Value, Option, Aggregate Differences, Long-term And Short-Term Debt Instruments Fair Value, Option, Aggregate Differences, Long-term And Short-Term Debt Instruments Contributions to investments in and loans to related parties Payments to Fund Long-Term Loans to Related Parties Non-NEOs Non-NEOs [Member] Overnight and Continuous Maturity Overnight [Member] Ownership percentage Ownership percentage Equity Method Investment, Ownership Percentage Financial instruments owned, measurement input, term Financial Instruments, Owned, Measurement Input, Term Financial Instruments, Owned, Measurement Input, Term Year ending November 30, 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two 2026 Guarantees Expected To Be Due, Remainder Of Fiscal Year Guarantees Expected To Be Due, Remainder Of Fiscal Year Schedule of Credit Related Derivative Contracts Disclosure of Credit Derivatives [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] 2027 Long-Term Debt, Maturity, Year One Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Additional loans, face amount Loan Receivable, Face Amount, Additional Loan Loan Receivable, Face Amount, Additional Loan Deferred revenue Contract with Customer, Liability, Current Purchase of common shares for treasury Payments for Repurchase of Common Stock Range [Axis] Statistical Measurement [Axis] Schedule of Unrealized and Realized Gains (Losses) on Derivative Contracts Derivative Instruments, Gain (Loss) [Table Text Block] Cash on deposit for regulatory purposes with clearing and depository organizations Cash And Securities Segregated And On Deposit For Regulatory Purposes With Clearing And Depository Organizations Cash And Securities Segregated And On Deposit For Regulatory Purposes With Clearing And Depository Organizations Stock Option And Share-Based Awards Stock Option And Share-Based Awards [Member] Stock Option And Share-Based Awards Real Estate Investments Real Estate Investments [Member] Real Estate Investments Customers Increase (Decrease) in Payables to Customers Award Type [Axis] Award Type [Axis] Interest rate contracts: Interest rate contracts Interest Rate Contract [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Real estate revenues Real Estate [Member] Retained earnings Retained Earnings (Accumulated Deficit) Conversion of stock, share converted ratio Conversion Of Stock, Share Converted Ratio Conversion Of Stock, Share Converted Ratio Fixed rate Fixed Rate Debt [Member] Fixed Rate Debt Product and Service [Axis] Product and Service [Axis] Fair value of equity investment Equity Securities, FV-NI Total OTC derivative liabilities included in Financial instruments sold, not yet purchased Otc Derivative Liabilities Included In Financial Instruments Sold Not Yet Purchased OTC Derivative Liabilities Included In Financial Instruments Sold Not Yet Purchased. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Short-term Debt [Line Items] Short-Term Debt [Line Items] Common Stock Common Stock [Member] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] 2.750% Senior Notes Due 2032 Two Point Seven Five Percentage Senior Notes, Due 2032 [Member] Two Point Seven Five Percentage Senior Notes, Due 2032 CLOs Collateralized Loan Obligations Securitization Assets Collateralized Loan Obligations Securitization Assets Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Series B Preferred Stock Series B Preferred Stock [Member] Estimated future amortization expense Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Loss severity Measurement Input, Loss Severity [Member] Derivative Contract [Domain] Derivative Contract [Domain] Number of contracts, assets Derivative Asset, Number of Instruments Held Currency translation and other adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Conversion of preferred shares into non-voting common shares Conversion Of Preferred Shares To Non-Voting Common Shares [Member] Conversion Of Preferred Shares To Non-Voting Common Shares Derivatives Interest rate swaps Derivative Financial Instruments, Assets [Member] Total liabilities and equity Liabilities and Equity Brokers, dealers and clearing organizations Increase (Decrease) in Payable to Broker-Dealer and Clearing Organization Business development Business development Business development Business Development Stock options Share-Based Payment Arrangement, Option [Member] 0 – 12  Months Otc Derivative Assets Having Maturity Period Of Zero To Twelve Months Over the counter derivative assets having maturity period of zero to twelve months. Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Schedule of Derivative Instruments with Contingent Features Derivative Instruments With Contingent Features [Table Text Block] Derivative Instruments With Contingent Features [Table Text Block] Noncontrolling interests Total noncontrolling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] Other secured financings (includes $413,121 and $425,964 at fair value) Other secured financings Other Secured Financings Tabular List, Table Tabular List [Table Text Block] Net unrealized losses related to instrument-specific credit risk Net unrealized gains on instrument-specific credit risk at fair value AOCI, Gain (Loss), Debt Securities, Available-for-Sale, with Allowance for Credit Loss, Parent [Member] Estimated period for the liquidation of the underlying assets, minimum Expected Period For Liquidation Of Underlying Assets Minimum Expected Period For Liquidation Of Underlying Assets Minimum Bank loans and other credit facilities Notes Payable to Banks [Member] Exchange agreement, payment per share of voting common stock exchanged (in dollars per share) Exchange Agreement, Payment Per Share Of Voting Common Stock Exchanged Exchange Agreement, Payment Per Share Of Voting Common Stock Exchanged Credit Derivatives Contract Type [Axis] Credit Derivatives Contract Type [Axis] Year ending November 30, 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Remainder of fiscal year 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Asset management Asset Management Services [Member] Asset Management Services [Member] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Market Approach Valuation, Market Approach [Member] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Origination and syndication fee revenues Fees Earned To Joint Venture Related To Loan Origination Fees paid to joint venture related to loan origination. Series B preferred shares, par value of $1 per share, authorized 70,000 shares; 0 and 55,125 shares issued and outstanding Preferred Stock, Value, Issued Net amount Security Loaned, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Adjustment to Compensation: Adjustment to Compensation [Axis] Brokers, dealers and clearing organizations Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Derivatives Net derivatives Derivative Financial Instruments, Liabilities [Member] Lease liabilities Operating Lease And Finance Lease, Liability Operating Lease And Finance Lease, Liability Short term borrowings Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assume Short-Term Borrowings Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assume Short-Term Borrowings Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest Interest Paid, Excluding Capitalized Interest, Operating Activity 2027 Contractual Obligation, to be Paid, Year One Net carrying amount - indefinite lived intangible assets Indefinite Lived Intangible Asset Net Cost (After Impairment) Indefinite Lived Intangible Asset Net Cost (After Impairment) Loans and other receivables 90 days or greater past due Fair Value, Option, Loans Held as Assets, 90 Days or More Past Due, Aggregate Difference Allocation of earnings to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Securitization Vehicles [Line Items] Securitization Vehicles [Line Items] Securitization vehicles. Berkadia Berkadia Commercial Mortgage, LLC [Member] Berkadia Commercial Mortgage, LLC [Member] Name Measure Name Asset-backed vehicles Consumer Loan And Other Asset-Backed Vehicles [Member] Consumer Loan And Other Asset-Backed Vehicles [Member] Available collateral Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Pay vs Performance Disclosure [Line Items] Gross costs - indefinite lived intangible assets Indefinite Lived Intangible Assets Gross Indefinite lived Intangible asset Gross (before impairment). Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Restricted stock and RSUs Restricted Stock and Restricted Stock Units [Member] Restricted Stock and Restricted Stock Units [Member] Forward starting reverse repos Forward Starting Reverse Repos [Member] Forward Starting Reverse Repos [Member] Additional paid-in capital Additional Paid-in Capital [Member] Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Obligation to return securities received as collateral, at fair value Obligation to return securities received as collateral Obligation to Return Securities Received as Collateral Impairment Goodwill, Impairment Loss Payments on short-term borrowings Repayments of Short-Term Debt Other unfunded commitments Other Commitments [Member] Other Commitments [Member] Value of asset excluded from significant unobservable inputs Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Asset Exclusion Value Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Asset Exclusion Value Revenues not from contracts with customers Revenue Not from Contract with Customer Receivables: Increase (Decrease) in Receivables [Abstract] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Duration (years) Measurement Input, Expected Term [Member] Weighted average shares of restricted stock outstanding with future service required (in shares) Weighted Average Number of Shares, Restricted Stock Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] 5.500% Senior Notes Due 2036 Five Point Five Zero Zero Percentage Senior Notes, Due 2036 [Member] Five Point Five Zero Zero Percentage Senior Notes, Due 2036 Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Net earnings attributable to common shareholders for basic earnings per share Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Total return swaps Total Return Swap [Member] Gross Amounts Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, before Offset Loan commitments Loan Commitments [Member] Loan commitments. Unrecognized tax benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Schedule of Fair Value of OTC Derivatives Assets Counterparty Credit Quality With Respect To Fair Value Of Otc Derivatives Assets Table [Table Text Block] Counterparty credit quality with respect to the fair value of OTC derivatives assets. Non-PEO NEO Non-PEO NEO [Member] Credit contracts: Credit contracts Credit Risk Contract [Member] Total non-interest expenses Total non-interest expenses Noninterest Expense Gains (losses) recognized in interest expense on fair value hedge Gain (Loss) on Fair Value Hedges Recognized in Earnings Net transfers into/ (out of) Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net Percentage of target PSUs Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Target Performance Stock Units Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Target Performance Stock Units Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Other Other contracts with customers Product and Service, Other [Member] Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 6.200% Senior Notes Due 2034 Six Point Two Zero Zero Percentage Senior Notes, Due 2034 [Member] Six Point Two Zero Zero Percentage Senior Notes, Due 2034 Securitization Activities Transfers and Servicing of Financial Assets [Text Block] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Investments at fair value Investments [Member] Restatement Determination Date: Restatement Determination Date [Axis] Contributions Minority Interest Increase From Contributions Minority Interest Increase From Contributions Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Asset management fee revenues Payment for Management Fee Other investments Other Investments Other Investments 1 [Member] Other Investments 1 Netting in Consolidated Statements of Financial Condition Security Loaned, Subject to Master Netting Arrangement, Asset Offset Revenues Revenues [Abstract] Other changes in fair value Fair Value, Option, Changes in Fair Value, Gain (Loss) Collateral posted Collateral Already Posted, Aggregate Fair Value Mezzanine Equity Temporary Equity [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Range [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Amounts offset in the consolidated statements of financial condition, liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Structured Notes Structured Notes [Member] Structured Notes [Member] Common stock, issued Common Stock, Value, Issued Service period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Securities borrowed Net Amounts in Consolidated Statements of Financial Condition Securities borrowed Securities Borrowed Line of credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Amounts offset in the consolidated statements of financial condition, assets Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Investments in and loans to related parties Total Investments in and loans to related parties Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Repurchase agreements, pledged securities collateral Collateralized Financing Transactions, Pledged Securities Collateral Collateralized Financing Transactions, Pledged Securities Collateral Borrowings Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assume, Borrowings Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assume, Borrowings Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Accrued interest on unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Accrued Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Liabilities held for sale: Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Shares converted (in shares) Conversion of Stock, Shares Converted Retained Interests Retained Interest, Fair Value Disclosure Credit default swaps Credit Default Swap [Member] Changes in fair value related to instrument-specific credit risk OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax Disposal Group Classification [Axis] Disposal Group Classification [Axis] Standby Letters of Credit Standby Letters of Credit [Member] Financial instruments sold, not yet purchased Increase (Decrease) in Financial Instruments Sold, Not yet Purchased Loss Contingencies [Table] Loss Contingencies [Table] Investments [Domain] Investments [Domain] Equities and wealth management Equities And Wealth Management Segment [Member] Equities And Wealth Management Segment Other secured financings Fair Value, Option, Aggregate Differences, Other Secured Financings Fair Value, Option, Aggregate Differences, Other Secured Financings Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers of assets from Level 2 to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Entity Address, State or Province Entity Address, State or Province Net Capital Requirements [Table] Net Capital Requirements [Table] Net Capital Requirements [Table] PEO Total Compensation Amount PEO Total Compensation Amount Numerator for earnings per common share: Numerator For Earnings Per Share [Abstract] Numerator For Earnings Per Share [Abstract] Currency translation adjustments and other Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Basic weighted-average common shares outstanding (in shares) Weighted average basic common shares (in shares) Weighted Average Number of Shares Outstanding, Basic Cash collateral pledged Cash Collateral Pledge Cash collateral pledged that was netted against OTC derivative liabilities. Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] ApiJect ApiJect [Member] ApiJect Gross Amounts Security Loaned, Subject to Master Netting Arrangement, before Offset Other secured financings: Other secured financings Other Secured Financings [Member] Other Secured Financings [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Loans and other receivables 90 days or greater past due Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status Collateralized debt obligations and collateralized loan obligations CDOs and CLOs Collateralized Debt Obligations And Collateralized Loan Obligations [Member] Collateralized Debt Obligations and Collateralized Loan Obligations [Member] Revenue associated with distribution services, a portion of which related to prior periods Contract with Customer, Performance Obligation Satisfied in Previous Period Non-interest revenues Noninterest Income Energy Tax Credit Vehicles Energy Tax Credit Vehicles [Member] Energy Tax Credit Vehicles Commercial paper outstanding Commercial Paper Document Information [Line Items] Document Information [Line Items] Estimated revenue Measurement Input, Long-Term Revenue Growth Rate [Member] Assets held for sale Total assets held for sale Disposal Group, Including Discontinued Operation, Assets Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Equity commitments Equity Commitments [Member] Equity commitments. Accumulated amortization - finite lived intangible assets Intangible Asset, Finite-Lived, Accumulated Amortization Receivable [Domain] Receivable [Domain] Assets Acquired - indefinite-lived intangible assets Intangible Asset, Indefinite-Lived, Acquired Cross-product counterparty netting Derivative Assets Cross Product Counterparty Netting Derivative Assets Cross Product Counterparty Netting. Repurchase Agreements Repurchase agreements Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Dividends - preferred shares Dividends - preferred shares Dividends, Preferred Stock Net settlements Gain (Loss) On Fair Value Hedges Recognized In Earnings, Settlements, Net Gain (Loss) On Fair Value Hedges Recognized In Earnings, Settlements, Net Accounting Standards to be Adopted in Future Periods and Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Noncontrolling interests Noncontrolling Interest [Member] Financial instruments owned, at fair value (includes securities pledged of $17,552,721 and $17,419,373) Financial instruments owned Financial instruments owned, at fair value Financial Instruments, Owned, at Fair Value Unsecured Debt Unsecured Debt [Member] Denominator for earnings per common share: Denominator For Earnings Loss Per Share, Basic [Abstract] Denominator For Earnings Loss Per Share, Basic Long-term debt (includes $3,941,920 and $3,734,843 at fair value) Long-term debt Total Long-Term Debt Migration period Disposal Group Including Discontinued Operation, Transition Period Disposal Group Including Discontinued Operation, Transition Period 31-90 Days Maturity 30 to 90 Days [Member] Net change in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Gross, unrecognized tax benefits Unrecognized Tax Benefits Loan commitment Aggregate Loan Commitment Aggregate loan commitment to joint venture. Cash paid during the period for: Cash Paid Received During Period [Abstract] Cash paid (received) during the period for: Total Equity Equity [Text Block] Conversion of Stock, Name [Domain] Conversion of Stock, Name [Domain] Security Exchange Name Security Exchange Name Counterparty and cash collateral netting, liabilities Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Schedule Of Securitization Vehicles [Table] Schedule Of Securitization Vehicles [Table] Schedule of Securitization Vehicles. Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Impairment Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Geographical [Domain] Geographical [Domain] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] 1 – 5 Years Otc Derivative Liabilities Having Maturity Period Of One To Five Years OTC derivative liabilities having maturity period of 1 to 5 years. Jefferies Inc Jefferies Inc [Member] Jefferies Inc Other investments Various Other Investment Segment [Member] Various Other Investment Segment Net minimum pension liability Amortization of defined benefit pension plan actuarial losses Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt gross Long-Term Debt, Gross Total OTC derivative assets included in Financial instruments owned OTC Derivative Assets Included In Financial Instruments Owned OTC Derivative Assets Included In Financial Instruments Owned Investment banking - Underwriting Investment Banking, Underwriting [Member] Investment Banking, Underwriting [Member] Weighted average life of assets and liabilities Weighted Average Life Of Assets and Liabilities With A Basis Difference Weighted Average Life Of Assets and Liabilities With A Basis Difference Asset Class [Domain] Asset Class [Domain] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Expenses to fulfill a contract Capitalized Contract Cost, Amortization Individual: Individual [Axis] Diluted weighted-average common shares outstanding (in shares) Weighted average diluted common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Capital distributions from investments and repayments of loans from related parties Proceeds from Collection of Long-Term Loans to Related Parties Entity Emerging Growth Company Entity Emerging Growth Company Related Party Transaction [Line Items] Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Allocation of distributed earnings (cash dividends paid) Distributed Earnings (Loss) from Continuing Operations Available to Common Shareholders, Basic Distributed Earnings (Loss) from Continuing Operations Available to Common Shareholders, Basic Maximum Exposure to Loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Fair value, liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other receivables Other Receivables Term loan Term Loan Receivable [Member] Term Loan Receivable Europe and the Middle East Europe And Middle East [Member] Europe And Middle East Brokerage and clearing fees Brokerage and clearing fees Floor Brokerage, Exchange and Clearance Fees Investment Redemption Prior Written Notice Period [Domain] Investment Redemption Prior Written Notice Period [Domain] [Domain] for Investment Redemption Prior Written Notice Period [Axis] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Financial instruments sold, not yet purchased, at fair value Financial instruments sold, not yet purchased Financial instruments sold, not yet purchased, at fair value Financial Instruments Sold, Not yet Purchased, at Fair Value Customers Customers Receivable from Customer in Brokerage Organization, Consolidation and Presentation of Financial Statements [Abstract] Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Origination fee expenses Fees Paid To Joint Venture Related To Loan Origination Fees paid to joint venture related to loan origination. Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Schedule of Fair Value Option Gains (Losses) and Summary of Contractual Principal Exceeds Fair Value for Loans and Other Receivables Fair Value Option, Disclosures [Table Text Block] Forward starting repos Forward Starting Repos [Member] Forward Starting Repos [Member] Schedule of Remaining Contract Maturity of Fair Value of OTC Derivative Assets and Liabilities Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities Table [Table Text Block] OTC derivatives by risk exposure and maturity profile. Cross-product counterparty netting Derivative Liabilities Cross Product Counterparty Netting Derivative Liabilities Cross Product Counterparty Netting All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Estimated recovery percentage Measurement Input, Estimated Recovery Percentage [Member] Measurement Input, Estimated Recovery Percentage [Member] Officers And Employees Officers And Employees [Member] Officers And Employees 2030 and 2031 Guarantees Expected To Be Due, Year Four And Five Guarantees Expected To Be Due, Year Four And Five Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Embedded options Embedded Derivative Financial Instruments [Member] Total financial instruments owned, excluding Investments at fair value based on NAV Financial Instruments, Owned, At Fair Value Excluding Investments At Net Asset Value Financial Instruments, Owned, At Fair Value Excluding Investments At Net Asset Value Redeemable noncontrolling interests Total mezzanine equity Redeemable Noncontrolling Interest, Equity, Carrying Amount Intangible assets Disposal Group, Including Discontinued Operation, Intangible Assets Notice period redemption of investment prior written notice period Notice Period Redemption Of Investments Prior Written Notice Period Investments at fair value that cannot be redeemed at reporting date and are subject to a prior written redemption request. Assets: Fair Value Assets Measured On Recurring Basis [Abstract] Fair value assets measured on recurring basis. Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Restricted stock units with no future service required Restricted Stock Units With No Future Service Required [Member] Restricted Stock Units With No Future Service Required [Member] Schedule of Earnings Per Share Computation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Hildene Insurance Holdings, LLC Hildene Insurance Holdings, LLC [Member] Hildene Insurance Holdings, LLC Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Total derivative contracts Derivative [Member] Other liabilities Other Liabilities Exchange traded derivative liabilities, with fair value Exchange Traded Derivative Liabilities Fair value of exchange traded derivative liabilities. Dividends - common shares ($0.40, $0.40, $1.20, $1.20 per share) Dividends, Common Stock Common shares, authorized (in shares) Common Stock, Shares Authorized Weighted Average Remaining Lives (Years) Intangible Asset, Finite-Lived, Useful Life Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Exercise Price Award Exercise Price Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Document Quarterly Report Document Quarterly Report Securities or Other Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Variable rate Variable Rate Debt [Member] Variable Rate Debt Europe and the Middle East Europe [Member] Regulatory Requirements Regulatory Capital Requirements under Banking Regulations [Text Block] Effect of exchange rate changes on cash, cash equivalents, and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Unrated Fair Value Of Over Counter Derivatives Assets Counterparty Credit Quality Unrated Fair value of OTC derivatives assets, counterparty credit quality unrated. Net underwriting revenues Underwriting Revenue (Expense) Underwriting Revenue (Expense) Repayment of long-term debt Repayments of Long-Term Debt Preferred stock, liquidation preference per share (in dollars per share) Preferred Stock, Liquidation Preference Per Share Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Our total equity balance Our total investment balance Equity Method Investments Fees, interest and other Increase (Decrease) in Other Receivables Equity Component [Domain] Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Total gains/(losses) (realized and unrealized) Net gains (losses) on Level 3 assets (realized and unrealized) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Loans, fair value Loans Receivable, Fair Value Disclosure Foreign exchange contracts: Foreign exchange contracts Foreign Exchange Contract [Member] Letters of credit commitments expiration period Standby Letters Of Credit Expiration Period Standby Letters Of Credit Expiration Period Investment Banking and Capital Markets Investment Banking and Capital Markets Investment Banking And Capital Markets Segment [Member] Investment Banking And Capital Markets Segment Adoption Date Trading Arrangement Adoption Date Revenue related to performance obligations satisfied Contract With Customer, Performance Obligation Satisfied Contract With Customer, Performance Obligation Satisfied Counterparty Name [Domain] Counterparty Name [Domain] Brokers, dealers and clearing organizations Brokers, dealers and clearing organizations Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization Tax credits Investment Tax Credit Restricted cash awards Restricted cash awards Restricted Cash Awards [Member] Restricted Cash Awards [Member] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Potential maximum increase to common shares outstanding from outstanding awards (in shares) Potential Maximum Increase To Common Shares Outstanding From Outstanding Awards Potential Maximum Increase To Common Shares Outstanding From Outstanding Awards Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Real Estate and Other Funds Real Estate And Other Funds [Member] Real Estate And Other Funds Stock options, outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Income on investments in and loans to related parties Income On Loans To And Investments In Related Parties Income On Loans To And Investments In Related Parties Interest income Interest Income, Operating Earnings not allocated to segments Other Operating Income U.S. government agency CMBS Us Government Agency Issued Cmbs [Member] Us Government Agency Issued Cmbs [Member] Other Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Net repayments Repayments of Debt 2028 and 2029 Guarantees Expected To Be Due, Year Two And Three Guarantees Expected To Be Due, Year Two And Three Numerator for earnings per common share: Numerator For Earnings Per Share, Basic [Abstract] Numerator For Earnings Per Share, Basic Schedule of Fair Value Inputs Assets and Liabilities Quantitative Information Table Fair Value Inputs Assets And Liabilities Quantitative Information Table [Table Text Block] Tabular disclosure of quantitative information about significant unobservable inputs used in the fair value measurement of Level 3 financial assets and liabilities, including valuation technique and range of inputs Change in equity interest related to consolidated subsidiaries Noncontrolling Interest, Increase from Subsidiary Equity Issuance Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Operating lease income Operating Lease, Lease Income Investment banking Investment banking Investment Banking Segment [Member] Investment Banking [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Secured convertible promissory notes Financing Receivable, Excluding Accrued Interest, Purchase Weighted Average Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Securities received as collateral, at fair value Securities received as collateral Securities Received as Collateral Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Table] Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Table] Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Table] Income Statement [Abstract] Income Statement [Abstract] Equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Net gains from our investments in JCP Fund V Gain on Investments Gain (Loss) on Investments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Securities lending arrangements Securities Loaned [Abstract] Intangible Asset, Finite-Lived Intangible Asset, Finite-Lived [Table Text Block] Other Commitments [Domain] Other Commitments [Domain] Investments at fair value Investments At Fair Value [Member] Investments At Fair Value [Member] City Area Code City Area Code Document Information [Table] Document Information [Table] Volatility Measurement Input, Price Volatility [Member] Name Forgone Recovery, Individual Name Investment banking Investment banking Investment Banking [Member] Investment Banking [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity [Domain] Entity [Domain] Back-to-back committed sales contracts Back-To-Back Committed Sales Contracts [Member] Back-To-Back Committed Sales Contracts Schedule of Collateralized Financing Transactions Schedule Of Collateralized Financing Transactions [Table Text Block] Schedule of Collateralized Financing Transactions [Table Text Block] Preferred shares, issued (in shares) Preferred Stock, Shares Issued Termination notice period Line Of Credit Termination Notice Period Line of credit termination notice period. Unfunded commitment fees Line of Credit Facility, Unfunded Commitment Fee Income Line of Credit Facility, Unfunded Commitment Fee Income Other assets Increase (Decrease) in Other Operating Assets Compensation costs Share-Based Payment Arrangement, Expense Counterparty and cash collateral netting, assets Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Transferred assets Assets Transferred Due To Securitization Assets transferred due to securitization activities in which the Company had continuing involvement. Deferred revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Net unrealized losses on available-for-sale securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Net unrealized gains on available-for-sale-securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Outstanding Loan Commitments to Strategic Affiliates Outstanding Loan Commitments To Strategic Affiliates [Member] Outstanding Loan Commitments To Strategic Affiliates Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities from continuing operations Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld for tax withholding obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Proportional amortization Proportional Amortization Proportional Amortization Property and equipment Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation Adjustments to reconcile net earnings to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] 2029 Long-Term Debt, Maturity, Year Three Charge-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Commitments, Contingencies and Guarantees Commitments Contingencies and Guarantees [Text Block] Letters of credit commitments Standby Letters Of Credit Commitments Standby Letters Of Credit Commitments Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] 0 – 12 Months Otc Derivative Liabilities Having Maturity Period Of Zero To Twelve Months OTC derivative liabilities having maturity period of zero to twelve months. Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows received on retained interests Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Cross-Maturity Netting Otc Derivative Liabilities Cross Maturity Netting OTC derivative liabilities cross maturity netting. Financial Instruments [Domain] Financial Instruments [Domain] Interest rate swaps, options and forwards Interest Rate Swaps, Options and Forwards [Member] Interest Rate Swaps, Options and Forwards Net amounts per consolidated statements of financial condition, assets Derivative Asset 5.125% Senior Notes Due 2031 Five Point One Two Five Percentage Senior Notes, Due 2031 [Member] Five Point One Two Five Percentage Senior Notes, Due 2031 Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Goodwill and Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Revenues from Contracts with Customers Revenue from Contract with Customer [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Exchange and clearing organization membership interests and registrations Exchange And Clearing Organization Membership Interests And Registrations [Member] Exchange and clearing organization membership interests and registrations. Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Cash Cash Commissions and other fees Commissions and other fees Commissions and other fees Commissions And Other Fees [Member] Commissions And Other Fees [Member] Net earnings attributable to common shareholders Net Income (Loss) And Preferred Stock Dividends, Income Statement Impact Net Income (Loss) And Preferred Stock Dividends, Income Statement Impact Preferred Stock Preferred Stock [Member] Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Target level of ROTE Share-Based Compensation Arrangement By Share-Based Payment Award, Return On Tangible Equity, Target Level Share-Based Compensation Arrangement By Share-Based Payment Award, Return On Tangible Equity, Target Level Schedule of Nonvested Restricted Stock Units and Performance Based Units Activity Schedule Of Nonvested Restricted Stock Units And Performance Based Units Activity [Table Text Block] Schedule Of Nonvested Restricted Stock Units And Performance Based Units Activity Related Party Transaction [Table] Related Party Transaction [Table] Net bad debt expense Provision for Loan, Lease, and Other Losses Proceeds on new securitizations Proceeds On New Securitizations Proceeds On New Securitizations Schedule Of Securitization Vehicles [Line Items] Schedule Of Securitization Vehicles [Line Items] Schedule Of Securitization Vehicles [Line Items] Agency mortgage-backed securities Mortgage And Asset Backed Securitization Activity Agency [Member] Mortgage and asset backed securitization activity agency. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Variable Interest Entities, Name [Axis] Variable Interest Entities, Name [Axis] Variable Interest Entities, Name [Axis] Asia-Pacific Asia Pacific [Member] Current Fiscal Year End Date Current Fiscal Year End Date Hedge Funds Hedge Funds, Equity Long (Short) [Member] Private equity securities Private Equity Securities [Member] Private equity securities. Changes in unrealized gains/ (losses) included in other comprehensive income for instruments still held Fair Value, Liabilities Measured On Recurring Basis, Change In Unrealized Gain (Loss) Included In Other Comprehensive Income Fair Value, Liabilities Measured On Recurring Basis, Change In Unrealized Gain (Loss) Included In Other Comprehensive Income Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Fixed income Fixed Income Services [Member] Fixed Income Services [Member] Derivative [Line Items] Derivative [Line Items] Technology and communications Technology and communications Communications and Information Technology Stock repurchased (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Office Building Office Building [Member] Distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Stratos Stratos [Member] Stratos Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Schedule of VIEs Schedule of Variable Interest Entities [Table Text Block] Credit Derivatives Contract Type [Domain] Credit Derivatives Contract Type [Domain] Treasury stock, shares (in shares) Treasury Stock, Common, Shares Financial instruments owned Increase (Decrease) in Financial Instruments Used in Operating Activities Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Capitalized contract cost Capitalized Contract Cost, Net Income taxes, net Income Tax Paid, after Refund Received 2031 and Later Long-Term Debt, Maturity, Year Five And Thereafter Long-Term Debt, Maturity, Year Five And Thereafter Stock Conversion Description [Axis] Stock Conversion Description [Axis] Entity Interactive Data Current Entity Interactive Data Current Price Measurement Input, Offered Price [Member] Additional amounts available for setoff Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Entity Small Business Entity Small Business Comprehensive income attributable to common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Foreign currency forwards, swaps and options Foreign Currency Forwards Swaps And Options [Member] Foreign currency forwards swaps and options. Shares withheld for tax withholding obligation (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Securities Lending Arrangements Securities lending arrangements Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred Lease liabilities Disposal Group, Including Discontinued Operation, Assets, Lease Liabilities Disposal Group, Including Discontinued Operation, Assets, Lease Liabilities Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Schedule of Investments Measured at Fair Value Based on Net Asset Value Per Share Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Debt instrument, valuation adjustments Debt Instrument, Valuation Adjustments Debt Instrument, Valuation Adjustments Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Schedule of Retained Interests in SPEs Securitization Activities And Variable Interest Entity Table [Table Text Block] Total information regarding securitization vehicles to which Jefferies, acting as transferor, have transferred assets and for which the Company received sale accounting treatment. Schedule of Remaining Unamortized Amounts Related to Certain Compensation Plans Schedule Of Share Based Compensation Allocation Of Period Costs And Amortization Period Table [Table Text Block] Schedule Of Share Based Compensation Allocation Of Period Costs And Amortization Period Table [Table Text Block] Exchange agreement, voting common stock to preferred stock ratio Exchange Agreement, Voting Common Stock To Preferred Stock Ratio Exchange Agreement, Voting Common Stock To Preferred Stock Ratio Intangible Asset, Indefinite-Lived Intangible Asset, Indefinite-Lived [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Other receivables Disposal Group, Including Discontinued Operation, Other Receivable, Net Disposal Group, Including Discontinued Operation, Other Receivable, Net Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Net proceeds from long term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number 45 Days Prior Written Notice 45 Days Prior Written Notice [Member] 45 Days Prior Written Notice Fair value of securities received as collateral Fair Value of Securities Received as Collateral that Can be Resold or Repledged Net investment hedging Net Investment Hedging [Member] Earnings from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Pledged Status [Domain] Pledged Status [Domain] Available collateral Securities Sold under Agreements to Repurchase, Fair Value of Collateral Reverse repurchase agreements Offsetting Securities Purchased under Agreements to Resell [Abstract] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Line Items] [Line Items] for Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table] [Table] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Year ending November 30, 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Net earnings attributable to common shareholders for diluted earnings per share Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Net revenues Net revenues Revenues, Net of Interest Expense Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Equity Liabilities Liabilities and Equity [Abstract] Netting in Consolidated Statements of Financial Condition Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Warrants purchased (in shares) Class of Warrant or Right, Outstanding Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Percentage of redeemable investments Redeemable Investments Investments redeemable within 60-90 days Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Non-investment Grade External Credit Rating, Noninvestment Grade [Member] Equity commitment Equity Commitment, Amount Equity Commitment, Amount Open Market Open Market [Member] Open Market Accrued expenses and other liabilities Accrued expenses and other liabilities Accounts Payable and Accrued Liabilities PEO Name PEO Name Investment banking - Advisory Investment Banking, Advisory [Member] Investment Banking, Advisory [Member] Short-term borrowings Short-term debt Other Short-Term Borrowings Net cash flow hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Other segment items Segment Reporting, Other Segment Item, Amount Common stock, as-converted basis Common Stock, As Converted, Ownership Percentage Common Stock, As Converted, Ownership Percentage Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number 1 – 5 Years Otc Derivative Assets Having Maturity Period Of One To Five Years OTC derivative assets having maturity period of 1 to5 years. Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Fixed income forwards Fixed Income Forward Contracts [Member] Fixed Income Forward Contracts [Member] Liabilities: Fair Value Liabilities Measured On Recurring Basis [Abstract] Fair value liabilities measured on recurring basis. Preferred stock dividends Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Investment Grade External Credit Rating, Investment Grade [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Equity contracts: Equity contracts Equity Contract [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Share-based compensation Share-Based Payment Arrangement, Noncash Expense Compensation and benefits Compensation and benefits Compensation and benefits Labor and Related Expense BBB- to BBB+ Fair Value Of Over Counter Derivatives Assets Counterparty Credit Quality Bbb To Bbb Fair value of OTC derivatives assets, counterparty credit quality BBB- to BBB. Borrow rate Measurement Input, Borrow Rate [Member] Measurement Input, Borrow Rate Disposal Group Name [Axis] Disposal Group Name [Axis] Funded equity commitments Funded Equity Commitments Funded amount of the committed equity capitalization at the balance sheet date. Schedule of Fair Value and Related Number of Derivative Contracts Categorized by Type of Derivative Contract Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Basic (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] 30 Days Prior Written Notice 30 Days Prior Written Notice [Member] 30 Days Prior Written Notice SBI USA Fund L.P. SBI USA Fund L.P. [Member] SBI USA Fund L.P. [Member] Commodity contracts: Commodity contracts Commodity Contract [Member] Schedule of Short-Term Borrowings Schedule of Short-Term Debt [Table Text Block] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Loss on disposal Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal JIL JIL [Member] JIL Principal transactions Principal transactions Principal Transactions Revenue [Member] Principal Transactions Revenue [Member] Sumitomo Mitsui Banking Corporation Agreement Sumitomo Mitsui Banking Corporation [Member] Sumitomo Mitsui Banking Corporation Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Interest rate on short-term borrowings outstanding Short-Term Debt, Weighted Average Interest Rate, at Point in Time Jefferies LLC Jefferies LLC [Member] A registered broker dealer under the Securities and Exchange act of 1934 and a wholly owned subsidiary of the Parent (Jefferies). Equity Awards Adjustments Equity Awards Adjustments [Member] Fair value of derivative contracts approximated deemed to meet the definition of a guarantee Guarantee Obligations Maximum Exposure Fair Value Guarantee obligations maximum exposure fair value. 54 Madison Capital, LLC 54 Madison Capital, LLC [Member] 54 Madison Capital, LLC [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Financial instruments owned Financial Instruments, Owned, at Fair Value Excluding Investments at Net Asset Value Financial Instruments, Owned, at Fair Value Excluding Investments at Net Asset Value Constant prepayment rate Measurement Input, Prepayment Rate [Member] Loans Loans Loans [Member] Proceeds from issuance of long-term debt, net of issuance costs Proceeds from Issuance of Senior Long-Term Debt Plan Name [Axis] Plan Name [Axis] Changes in instrument-specific credit risk Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax Derivative liability, measurement input Derivative Liability, Measurement Input Schedule of Components of Compensation Cost Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Consumer and other loans Other Debt Obligations [Member] Total Jefferies Financial Group Inc. shareholders' equity Parent [Member] Short-term Investments Short-Term Investments [Member] Jefferies Capital Partners V L.P. Jefferies Capital Partners V L.P [Member] Jefferies Capital Partners V L.P [Member] Equity investments Outstanding equity commitments Equity Commitments Committed equity capitalization. Administrative services General and Administrative Expense Conversion of preferred shares into non-voting common shares / Exchange of voting for non-voting common shares Stock Issued During Period, Value, Conversion of Convertible Securities Berkadia Berkadia [Member] Berkadia [Member] Preferred shares, authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Fair value, inputs, level 2 and level 3 Fair Value, Inputs, Level 2 And Level 3 [Member] Fair Value, Inputs, Level 2 And Level 3 [Member] Commercial mortgage-backed securities CMBS Commercial Mortgage-Backed Securities [Member] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] Grant date fair value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Granted In Period, Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Granted In Period, Fair Value Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Schedule of Stock by Class Schedule of Stock by Class [Table Text Block] Non-vested share-based awards Nonvested Share Awards [Member] Nonvested Share Awards [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Depreciation and amortization Depreciation and Other Amortization Depreciation and Other Amortization Other Investments Investments, Other [Member] Investments, Other [Member] Interest Interest Interest Interest Revenue [Member] Interest Revenue Discontinued Operations and Disposal Groups [Abstract] Net amount Security Borrowed, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Income Taxes Income Tax Disclosure [Text Block] Other adjustments Other Noncash Income (Expense) Asset Management Fees and Investment Return Asset Management Fees And Investment Return [Member] Asset Management Fees And Investment Return Schedule of Tax Years Subject to Examination Summary of Income Tax Examinations [Table Text Block] Securities purchased under agreements to resell Net Amounts in Consolidated Statements of Financial Condition Securities purchased under agreements to resell Securities Purchased under Agreements to Resell Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Other secured financings, fair value Other secured financings Other Secured Financings, Fair Value Other Secured Financings, Fair Value Entity Filer Category Entity Filer Category Supplemental disclosures of cash flow information: Supplemental Cash Flow Elements [Abstract] Director Director [Member] Available collateral Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Interest rate range Debt Instrument, Interest Rate During Period Greater than 90 Days Maturity Greater than 90 Days [Member] Unrealized and realized gains (losses) Gain (Loss) on Derivative Instruments, Net, Pretax Distributions we received Distributions we received Proceeds from Equity Method Investment, Distribution Variable Interest Entities, Name [Domain] Variable Interest Entities, Name [Domain] Variable Interest Entities, Name Derivatives not designated as accounting hedges: Not Designated as Hedging Instrument [Member] Accrued expenses and other liabilities Disposal Group, Including Discontinued Operation, Assets, Accrued Expenses And Other Liabilities Disposal Group, Including Discontinued Operation, Assets, Accrued Expenses And Other Liabilities Non option equity, outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] Investments, Debt and Equity Securities [Abstract] Variable Interest Entity, Liabilities, Eliminated In Consolidation Variable Interest Entity, Liabilities, Eliminated In Consolidation [Member] Variable Interest Entity, Liabilities, Eliminated In Consolidation Changes in unrealized gains/(losses) included in earnings for instruments still held Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Loan purchase commitments Loan Purchase Commitments [Member] Netting in Consolidated Statements of Financial Condition Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, Asset Offset Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Stock, Class of Stock [Table] Stock, Class of Stock [Table] Net earnings Net earnings Net losses attributable to noncontrolling interests Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Derivative liability Net amounts per consolidated statements of financial condition, liabilities Derivative Liability Changes in instrument specific credit risk, tax benefit (expense) OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments, Tax Entity Address, Address Line One Entity Address, Address Line One Financial instruments owned: Financial instruments owned: Financial instruments owned: Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract] Income tax expense Net benefits included in income tax expense Income tax (benefit) expense Income Tax Expense (Benefit) CLOs CLOs Collateralized Loan Obligations [Member] Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations Cash and Securities Segregated under Securities Exchange Commission Regulation Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Cross-Maturity Netting Otc Derivative Assets Cross Maturity Netting OTC derivative assets cross maturity netting. Consolidation Consolidation, Policy [Policy Text Block] A- or higher Fair Value Of Over Counter Derivatives Assets Counterparty Credit Quality A Or Higher Fair Value Of Over Counter Derivatives Assets Counterparty Credit Quality A Or Higher Reallocation of total earnings as a result of conversion of preferred shares to non-voting common shares Participating Securities, Conversion Of Preferred Stock To Non-Voting Stock, Diluted Participating Securities, Conversion Of Preferred Stock To Non-Voting Stock, Diluted Total CMBS securitization assets Cmbs Securitization Assets Represents unpaid principal amount of assets in commercial mortgage backed securitization vehicles at the balance sheet date. VIEs, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Accounting Developments Accounting Standards Update and Change in Accounting Principle [Text Block] Corporate Joint Venture Corporate Joint Venture [Member] Percent of financial information presented Equity Method Investment, Percent of Financial Information Presented Equity Method Investment, Percent of Financial Information Presented Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Goodwill Disposal Group, Including Discontinued Operation, Goodwill Principal collections of loans, notes and other receivables Proceeds from Collection of Loans Receivable Statement [Table] Statement [Table] Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Interest income Investment Income, Interest Other secured financings, measurement input Collateralized Financings, Measurement Input Collateralized Financings, Measurement Input Weighted average RSUs outstanding with no future service required (in shares) Weighted Average Number Of Shares, Restricted Stock Units Weighted Average Number Of Shares, Restricted Stock Units JFSI - SEC Jefferies Financial Services, Inc. SEC [Member] Jefferies Financial Services, Inc. SEC Additional amounts available for setoff Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Fair value, assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Ownership percentage Investments, Ownership Percentage Investments, Ownership Percentage Common stock, fully diluted, as-converted basis Common Stock, Fully Diluted, As Converted, Ownership Percentage Common Stock, Fully Diluted, As Converted, Ownership Percentage Proceeds from short-term borrowings Proceeds from Short-Term Debt Recoveries collected Accounts Receivable, Allowance for Credit Loss, Recovery Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]