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] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Weighted-average interest rate Debt, Weighted Average Interest Rate Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Adjustment to Compensation, Amount Adjustment to Compensation Amount 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] Segment Reporting [Abstract] Segment Reporting [Abstract] Investment Redemption Prior Written Notice Period [Domain] Investment Redemption Prior Written Notice Period [Domain] [Domain] for Investment Redemption Prior Written Notice Period [Axis] 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] Other assets Disposal Group, Including Discontinued Operation, Other Assets Jefferies Inc Jefferies Inc [Member] Jefferies Inc Notional/ Maximum Payout Guarantor Obligations, Maximum Exposure, Undiscounted Variable rate Variable Rate Debt [Member] Variable Rate Debt Receivables related to revenue from contracts with customers Contract with Customer, Asset, after Allowance for Credit Loss Collateral received Collateral Received, Aggregate Fair Value Collateral Received, Aggregate Fair Value Derivative Instrument [Axis] Derivative Instrument [Axis] 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. 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] Basis points upfront Measurement Input, Basis Points Upfront [Member] Measurement Input, Basis Points [Member] U.S. government and federal agency securities US Treasury and Government [Member] Reclassification to held for sale Goodwill, Divestiture Consolidated Entities [Axis] Consolidated Entities [Axis] Other revenues not allocated to segments Revenue Not from Contract with Customer, Other Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Assets held for sale: Disposal Group, Including Discontinued Operation, Assets [Abstract] Consumer and other loans Other Securitization Assets Other Securitization Assets Derivative contracts—non-credit related Derivative Contracts Non Credit Related [Member] Derivative contracts - non credit related. 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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] Net earnings attributable to Jefferies Financial Group Inc. Net Income (Loss) Available To Common Stockholders Net Income (Loss) Available To Common Stockholders 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 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] 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] Jefferies Capital Partners LLC Jefferies Capital Partners Llc [Member] Jefferies capital partners, LLC. 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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] Loans and other receivables Loans and other receivables Loans and Finance Receivables [Member] Non-voting Common Stock Nonvoting Common Stock [Member] 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] Related Party [Axis] Related and Nonrelated Parties [Axis] Service fees Service Fees Earned Service Fees Earned Secured Credit Facility Secured Credit Facility [Member] Secured Credit Facility 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] 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 Numerator for earnings per common share from continuing operations: Numerator For Earnings Per Share, Basic [Abstract] Numerator For Earnings Per Share, Basic 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 Funded equity commitments Funded Equity Commitments Funded amount of the committed equity capitalization at the balance sheet date. 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Expiration Date Trading Arrangement Expiration Date 2030 Long-Term Debt, Maturity, Year Four Hedging Relationship [Axis] Hedging Relationship [Axis] Letters of credit commitments Standby Letters Of Credit Commitments Standby Letters Of Credit Commitments Revenue related to performance obligations satisfied Contract With Customer, Performance Obligation Satisfied Contract With Customer, Performance Obligation Satisfied Equities Equities [Member] Equities [Member] Non-exchange-traded securities Non Exchange Traded Securities [Member] Non-exchange traded securities. 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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] Number of operating segments Number of Operating Segments Goodwill Goodwill [Table Text Block] Goodwill Goodwill, Gross Entity Central Index Key Entity Central Index Key Equity options and forwards Equity Forwards Swaps And Options [Member] Equity Forward, Swaps And Options [Member] 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 Underwriting revenues (expenses) Underwriting Revenue (Expense) Underwriting Revenue (Expense) 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 4..500% Senior Unsecured Note Due 2033 4..500% Senior Unsecured Note Due 2033 [Member] 4..500% Senior Unsecured Note Due 2033 Repurchase agreements, pledged securities collateral Collateralized Financing Transactions, Pledged Securities Collateral Collateralized Financing Transactions, Pledged Securities Collateral Interest Interest Interest Interest Revenue [Member] Interest Revenue Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Arcadia Leasing II LLC Arcadia Leasing II LLC [Member] Arcadia Leasing II LLC Accumulated other comprehensive loss, net of tax Total accumulated other comprehensive loss, net of tax AOCI Attributable to Parent [Member] 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] 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] 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 Schedule of Collateralized Financing Transactions Schedule Of Collateralized Financing Transactions [Table Text Block] Schedule of Collateralized Financing Transactions [Table Text Block] 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 Percentage of profits received from joint venture Percentage Of Profits Received From Joint Venture Percentage Of Profits Received From Joint Venture 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 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] Operating Segments Operating Segments [Member] Equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount 1 – 5 Years Otc Derivative Assets Having Maturity Period Of One To Five Years OTC derivative assets having maturity period of 1 to5 years. 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Available collateral Securities Purchased under Agreements to Resell, Fair Value of Collateral Berkadia Berkadia Commercial Mortgage, LLC [Member] Berkadia Commercial Mortgage, LLC [Member] Lease liabilities Disposal Group, Including Discontinued Operation, Assets, Lease Liabilities Disposal Group, Including Discontinued Operation, Assets, Lease Liabilities Aggregate amortization expense Intangible Asset, Finite-Lived, Amortization Expense Asset management fees and revenues Asset management fees Asset Management [Member] 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 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 Other asset-backed securities Other ABS Other Asset Backed Securities [Member] Other asset-backed securities. Securities borrowed Increase (Decrease) in Securities Borrowed 54 Madison Capital, LLC 54 Madison Capital, LLC [Member] 54 Madison Capital, LLC [Member] 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 Schedule of Selected Financial Information related to Equity Method Investment Equity Method Investments [Table Text Block] Stock repurchased Stock Repurchased During Period, Value 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 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 Excess Net Capital Broker-Dealer, Excess Net Capital, Alternative Standard Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Commodity swaps, options and forwards Commodity Swaps Options And Forwards [Member] Commodity swaps options and forwards. Cross-Maturity Netting Otc Derivative Liabilities Cross Maturity Netting OTC derivative liabilities cross maturity netting. Conversion of stock, share converted ratio Conversion Of Stock, Share Converted Ratio Conversion Of Stock, Share Converted Ratio Investments at fair value Investments At Fair Value [Member] Investments At Fair Value [Member] 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] Total committed equity capitalization of JFIN Commitments Under Equity Capitalization Of Joint Venture Entity Commitments under equity capitalization of joint venture entity. Sovereign obligations Sovereign Debt [Member] Equity Method Investment [Table] Equity Method Investment [Table] Sale of Stock [Axis] Sale of Stock [Axis] Private equity securities Private Equity Securities [Member] Private equity securities. Restricted cash awards Restricted cash awards Restricted Cash Awards [Member] Restricted Cash Awards [Member] Total earnings for reportable segments Operating Income (Loss) Schedule of Dividends Declared Dividends Declared [Table Text Block] Securities loaned Increase (Decrease) in Securities Loaned Transactions Net amount Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, after Offset Equity options Equity Option [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] 2027 Guarantees Expected To Be Due, Year One Guarantees Expected To Be Due, Year One Securities sold under agreements to repurchase Increase (Decrease) in Payables under Repurchase Agreements Corporate equity securities Corporate equity securities Equity Securities [Member] Currency losses on foreign currency borrowings Conversion Gains and Losses on Foreign Investments Asset Management Asset Management Asset Management Asset Management Segment [Member] Asset Management Segment [Member] Impairment of assets Asset, Impairment Loss Common shares, issued after deducting shares held in treasury (in shares) Common Stock, Shares, Issued 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 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 Outstanding Loan Commitments to Clients Outstanding Loan Commitments To Clients [Member] Outstanding Loan Commitments To Clients Net Capital Requirements [Table] Net Capital Requirements [Table] Net Capital Requirements [Table] Increase of long-term debt Debt Instrument, Increase (Decrease), Net 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 Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-term debt Long-Term Debt [Member] Non-interest expenses Noninterest Expense [Abstract] Origination fee expenses Fees Paid To Joint Venture Related To Loan Origination Fees paid to joint venture related to loan origination. 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] 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] 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] 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] Additional amounts available for setoff Security Loaned, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset 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 Lease liabilities Operating Lease And Finance Lease, Liability Operating Lease And Finance Lease, Liability Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Liabilities: Fair Value Liabilities Measured On Recurring Basis [Abstract] Fair value liabilities measured on recurring basis. 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 Arrangement Duration Trading Arrangement Duration 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 Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Ownership percentage Investments, Ownership Percentage Investments, Ownership Percentage Profit sharing plan Profit Sharing Plan [Member] Profit Sharing Plan [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 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 Other secured financings Secured Debt, Other Payables: Increase (Decrease) in Operating Liabilities [Abstract] 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 Other Investments Investments, Other [Member] Investments, Other [Member] Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Aggregate amount of infrastructure improvement bonds, outstanding Aggregate Amount Of Infrastructure Improvement Bonds Outstanding Aggregate Amount Of Infrastructure Improvement Bonds Outstanding Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] 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. 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] Equity Award [Domain] Award Type [Domain] Underwriting costs Underwriting Costs Underwriting Costs 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 30 Days Prior Written Notice 30 Days Prior Written Notice [Member] 30 Days Prior Written Notice Share price (in dollars per share) Share Price Geographical [Axis] Geographical [Axis] Segregated cash Restricted Cash 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] Financial instruments owned, measurement input Financial Instruments, Owned, Measurement Input Financial Instruments, Owned, Measurement Input Credit Funds Credit Funds [Member] Credit Funds Other assets (includes assets pledged of $717,897 and $627,259) Other assets Carrying value 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] Other Other VIEs [Member] Other VIEs Purchase of common shares for treasury Treasury Stock, Value, Acquired, Cost Method Commissions and other fees Commissions and other fees Commissions and other fees Commissions And Other Fees [Member] Commissions And Other Fees [Member] 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 Contributions to investments in and loans to related parties Payments to Fund Long-Term Loans to Related Parties Non-NEOs Non-NEOs [Member] Non-vested share-based awards Nonvested Share Awards [Member] Nonvested Share Awards [Member] Overnight and Continuous Maturity Overnight [Member] Ownership percentage Ownership percentage Equity Method Investment, Ownership Percentage 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. Year ending November 30, 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two 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. SBI USA Fund L.P. SBI USA Fund L.P. [Member] SBI USA Fund L.P. [Member] 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] 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] Customers Increase (Decrease) in Payables to Customers Award Type [Axis] Award Type [Axis] Placement and referral fee revenues Investment Fund Placement And Referral Fee Revenue Investment Fund Placement And Referral Fee Revenue 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 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) Product and Service [Axis] Product and Service [Axis] Fair value of equity investment Equity Securities, FV-NI 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] 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) Securities borrowing arrangements Collateralized Financing Transactions Securities Borrowing Arrangements Collateralized Financing Transactions Securities Borrowing Arrangements Derivatives Interest rate swaps Derivative Financial Instruments, Assets [Member] Total liabilities and equity Liabilities and Equity Contributions Minority Interest Increase From Contributions Minority Interest Increase From Contributions 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] 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] 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 investment vehicles Other Investment Vehicles [Member] Other Investment Vehicles [Member] Other secured financings (includes $415,801 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] Bank loans and other credit facilities Notes Payable to Banks [Member] U.S. government agency RMBS Us Government Agency Issued Rmbs [Member] Us Government Agency Issued Rmbs [Member] Investment banking Investment banking Investment Banking [Member] Investment Banking [Member] 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 CLOs Collateralized Loan Obligations Securitization Assets Collateralized Loan Obligations Securitization Assets 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] Schedule Of Commitments And Guarantee Obligations [Table] Schedule Of Commitments And Guarantee Obligations [Table] Schedule Of Commitments And Guarantee Obligations. Market Approach Valuation, Market Approach [Member] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Series B preferred shares, par value of $1 per share, authorized 70,000 shares; 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] 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 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] Equity commitment Equity Commitment, Amount Equity Commitment, Amount Name Measure Name 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] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] 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. 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 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 Unfunded portion of equity commitment to subsidiary Equity Commitment To Joint Venture Unfunded Portion Equity commitment to joint venture unfunded portion. Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Company Selected Measure Amount Company Selected Measure Amount Outstanding Loan Commitments to Strategic Affiliates Outstanding Loan Commitments To Strategic Affiliates [Member] Outstanding Loan Commitments To Strategic Affiliates 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 Investment banking - Advisory Investment Banking, Advisory [Member] Investment Banking, Advisory [Member] Total return swaps Total Return Swap [Member] Gross Amounts Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, before Offset Unrecognized tax benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Non-PEO NEO Non-PEO NEO [Member] Credit contracts: Credit contracts Credit Risk Contract [Member] Fixed income forwards Fixed Income Forward Contracts [Member] Fixed Income Forward Contracts [Member] Additional loans, face amount Loan Receivable, Face Amount, Additional Loan Loan Receivable, Face Amount, Additional Loan 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 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 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 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] 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 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] 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 Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] 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. Asset management fee revenues Payment for Management Fee Related party private equity vehicles Private Equity Vehicles [Member] Private equity vehicles. 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] Fixed income Fixed Income Segment [Member] Fixed Income Segment 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 Equity commitments Equity Commitments [Member] Equity commitments. 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. Common stock, issued Common Stock, Value, Issued 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 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 Unrated Fair Value Of Over Counter Derivatives Assets Counterparty Credit Quality Unrated Fair value of OTC derivatives assets, counterparty credit quality unrated. JCP Fund V JCP Funds [Member] JCP Funds [Member] 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] Shares converted (in shares) Conversion of Stock, Shares Converted Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Liabilities held for sale: Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Retained Interests Retained Interest, Fair Value Disclosure Credit default swaps Credit Default Swap [Member] JFSI - CFTC Jefferies Financial Services, Inc CFTC [Member] Jefferies Financial Services, Inc CFTC 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] Real Estate and Other Funds Real Estate And Other Funds [Member] Real Estate And Other Funds Investments [Domain] Investments [Domain] 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 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 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 PEO Total Compensation Amount PEO Total Compensation Amount 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 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] Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Gross Amounts Security Loaned, Subject to Master Netting Arrangement, before Offset Jefferies Finance Jefferies Finance LLC [Member] Jefferies Finance LLC. 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Cash paid during the period for: Cash Paid Received During Period [Abstract] Cash paid (received) during the period for: Noncontrolling interests Noncontrolling Interest [Member] Financial instruments owned, at fair value (includes securities pledged of $15,400,089 and $17,419,373) Financial instruments owned Financial instruments owned, at fair value Financial Instruments, Owned, at Fair Value Unsecured Debt Unsecured Debt [Member] 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] Long-term debt (includes $3,860,273 and $3,734,843 at fair value) Long-term debt Total Long-Term Debt Surety policy issued Surety Policy Issued Surety Policy Issued Revenues from strategic affiliates Strategic Affiliates Revenue [Member] Strategic Affiliates Revenue 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] Denominator for earnings per common share: Denominator For Earnings Loss Per Share, Basic [Abstract] Denominator For Earnings Loss Per Share, Basic Percentage of not redeemable investments Not Redeemable Investments Not Redeemable Investments 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] HomeFed LLC HomeFed LLC [Member] HomeFed LLC - 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Schedule of Earnings Per Share Computation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Investment banking Investment banking Investment Banking Segment [Member] Investment Banking [Member] JIL JIL [Member] JIL 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] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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 Assets: Fair Value Assets Measured On Recurring Basis [Abstract] Fair value assets measured on recurring basis. 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Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Estimated recovery percentage Measurement Input, Estimated Recovery Percentage [Member] Measurement Input, Estimated Recovery Percentage [Member] Securities received as collateral, at fair value Securities received as collateral Securities Received as Collateral Income Statement [Abstract] Income Statement [Abstract] Equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Net gains (losses) from our investments in JCP Fund V 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] City Area Code City Area Code 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 Document Information [Table] Document Information [Table] Forward starting repos Forward Starting Repos [Member] Forward Starting Repos [Member] Volatility Measurement Input, Price Volatility [Member] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 60 Days Prior Written Notice 60 Days Prior Written Notice [Member] 60 Days Prior Written Notice [Member] Unfunded commitment fees Line of Credit Facility, Unfunded Commitment Fee Income Line of Credit Facility, Unfunded Commitment Fee Income Asset-backed vehicles Consumer Loan And Other Asset-Backed Vehicles [Member] Consumer Loan And Other Asset-Backed Vehicles [Member] Entity [Domain] Entity [Domain] 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. 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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] Cash collateral pledged Cash Collateral Pledge Cash collateral pledged that was netted against OTC derivative liabilities. Unrealized gains on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax 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 Jefferies GmbH Jefferies GmbH [Member] Jefferies GmbH Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld for tax withholding obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Other secured financings, measurement input Collateralized Financings, Measurement Input Collateralized Financings, Measurement Input 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. 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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 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] Other unfunded commitments Other Commitments [Member] Other Commitments [Member] 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 Net settlements Gain (Loss) On Fair Value Hedges Recognized In Earnings, Settlements, Net Gain (Loss) On Fair Value Hedges Recognized In Earnings, Settlements, Net Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Capitalized contract cost Capitalized Contract Cost, Net Income taxes, net (1) Income Tax Paid, after Refund Received Dividend equivalents Adjustments To Additional Paid In Capital, Dividend Equivalents Adjustments To Additional Paid In Capital, Dividend Equivalents 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 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 Net Capital Requirements [Line Items] Net Capital Requirements [Line Items] Net Capital Requirements [Line Items] Shares withheld for tax withholding obligation (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Securities Lending Arrangements Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred Income tax credits and other income tax benefits Tax Credits And Other Income Tax Benefits Tax Credits And Other Income Tax Benefits Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 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 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] Fixed rate Fixed Rate Debt [Member] Fixed Rate Debt MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Loan commitments outstanding to clients Loan Commitments Outstanding Loan commitments outstanding to clients. Mortgage-backed and asset-backed securities Mortgage and Asset-Backed Securities [Member] Mortgage and Asset-Backed Securities [Member] Investment banking - Underwriting Investment Banking, Underwriting [Member] Investment Banking, Underwriting [Member] Other secured financings Other Secured Financings At Fair Value [Member] Other Secured Financings At Fair Value [Member] 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] Other investments Various Other Investment Segment [Member] Various Other Investment Segment Intangible Asset, Indefinite-Lived Intangible Asset, Indefinite-Lived [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Berkadia Berkadia [Member] Berkadia [Member] 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 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] Letters of credit commitments expiration period Standby Letters Of Credit Expiration Period Standby Letters Of Credit Expiration Period 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 from continuing operations 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] Securitization Vehicles [Line Items] Securitization Vehicles [Line Items] Securitization vehicles. Receivable Type [Axis] Receivable Type [Axis] Net revenues Net revenues Revenues, Net of Interest Expense Common stock, as-converted basis Common Stock, As Converted, Ownership Percentage Common Stock, As Converted, Ownership Percentage Counterparty Name [Axis] Counterparty Name [Axis] Liabilities and Equity Liabilities Liabilities and Equity [Abstract] 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 Netting in Consolidated Statements of Financial Condition Security Borrowed, Subject to Master Netting Arrangement, Liability Offset Net proceeds from (payments on) other secured financings Net Proceeds From (Payments On) Other Secured Financings Net Proceeds From (Payments On) Other Secured Financings Denominator for earnings per common share: Denominator For Earnings Loss Per Share [Abstract] Denominator For Earnings Loss Per Share [Abstract] Loans, face amount Loan Receivable, Face Amount Loan Receivable, Face Amount Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 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 Warrants purchased (in shares) Class of Warrant or Right, Outstanding Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Non-investment Grade External Credit Rating, Noninvestment Grade [Member] Bilateral OTC Bilateral Otc [Member] Bilateral OTC [Member] Accrued expenses and other liabilities Accrued expenses and other liabilities Accounts Payable and Accrued Liabilities PEO Name PEO Name JFSI - SEC Jefferies Financial Services, Inc. SEC [Member] Jefferies Financial Services, Inc. SEC 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 Commitments And Guarantee Obligations [Line Items] Commitments And Guarantee Obligations [Line Items] Commitments and guarantee obligations. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Sumitomo Mitsui Banking Corporation Agreement Sumitomo Mitsui Banking Corporation [Member] Sumitomo Mitsui Banking Corporation Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] 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 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 Purchase commitment amount Purchase Commitment Amount Purchase Commitment Amount ApiJect ApiJect [Member] ApiJect 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] Principal transactions Principal transactions Principal Transactions Revenue [Member] Principal Transactions Revenue [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] Repurchase obligation settlement period Repos Obligation Settlement Period Repos Obligation Settlement Period Share-based compensation Share-Based Payment Arrangement, Noncash Expense Compensation and benefits Compensation and benefits Compensation and benefits Labor and Related Expense Other secured financings: Other secured financings Other Secured Financings [Member] Other Secured Financings [Member] 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 Callable preferred shares (in shares) Exchange of voting commons shares for non-voting common shares (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Drawdown Of Unsecured Credit Facility Drawdown Of Unsecured Credit Facility [Member] Drawdown Of Unsecured Credit Facility 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) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Insider Trading Arrangements [Line Items] Exchange traded derivative assets, with fair value Exchange Traded Derivative Assets Fair value of exchange traded derivative assets. Commodity contracts: Commodity contracts Commodity Contract [Member] Schedule of Short-Term Borrowings Schedule of Short-Term Debt [Table Text Block] 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. Weighted average common shares outstanding (in shares) Weighted Average Common Shares Outstanding Weighted Average Common Shares Outstanding Cross-product counterparty netting Derivative Liabilities Cross Product Counterparty Netting Derivative Liabilities Cross Product Counterparty Netting 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 Variable Interest Entities, Name [Domain] Variable Interest Entities, Name [Domain] Variable Interest Entities, Name Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Variable Interest Entity, Liabilities, Eliminated In Consolidation Variable Interest Entity, Liabilities, Eliminated In Consolidation [Member] Variable Interest Entity, Liabilities, Eliminated In Consolidation Asset management Asset Management Services [Member] Asset Management Services [Member] 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. Interest rate on short-term borrowings outstanding Short-Term Debt, Weighted Average Interest Rate, at Point in Time Equity Awards Adjustments Equity Awards Adjustments [Member] 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] 2026 Guarantees Expected To Be Due, Remainder Of Fiscal Year Guarantees Expected To Be Due, Remainder Of Fiscal Year Hedging Relationship [Domain] Hedging Relationship [Domain] Constant prepayment rate Measurement Input, Prepayment Rate [Member] Securities borrowing arrangements, collateral Collateralized Financing Transactions Securities Borrowing Arrangements Collateral Collateralized Financing Transactions Securities Borrowing Arrangements Securities Collateral Received Loans Loans Loans [Member] Variable Interest Entity, Assets, Eliminated In Consolidation Variable Interest Entity, Assets, Eliminated In Consolidation [Member] Variable Interest Entity, Assets, Eliminated In Consolidation 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 Securitization Vehicles [Table] Schedule Of Securitization Vehicles [Table] Schedule of Securitization Vehicles. Numerator for earnings per common share from continuing operations: Numerator For Earnings Per Share [Abstract] Numerator For Earnings Per Share [Abstract] Schedule of Components of Compensation Cost Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Structured Notes Structured Notes [Member] Structured Notes [Member] Consumer and other loans Other Debt Obligations [Member] Total Jefferies Financial Group Inc. shareholders' equity Parent [Member] VIE Assets Variable Interest Entity Carrying Amount Of Assets Non Consolidated Vie Variable Interest Entity Carrying Amount Of Assets Non Consolidated Vie Short-term Investments Short-Term Investments [Member] Exchange of 9,247,081 voting for non-voting common shares Stock Issued During Period, Value, Conversion of Convertible Securities Preferred shares, authorized (in shares) Preferred Stock, Shares Authorized Brooklyn Renaissance Plaza Office Brooklyn Renaissance Plaza Office [Member] Brooklyn Renaissance Plaza Office Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Agency mortgage-backed securities Mortgage And Asset Backed Securitization Activity Agency [Member] Mortgage and asset backed securitization activity agency. 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] 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] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount 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) Interest rate swaps, options and forwards Interest Rate Swaps, Options and Forwards [Member] Interest Rate Swaps, Options and Forwards 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] Entity Filer Category Entity Filer Category Supplemental Cash Flow Elements Supplemental Cash Flow Elements [Abstract] Director Director [Member] Available collateral Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Equity investments Outstanding equity commitments Equity Commitments Committed equity capitalization. Schedule of Offsetting Liabilities Offsetting Liabilities [Table Text Block] Residential mortgage-backed and other asset-backed securities Residential Mortgage-Backed And Other Asset-Backed Securities [Member] Residential Mortgage-Backed And Other Asset-Backed Securities 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 Derivatives not designated as accounting hedges: Not Designated as Hedging Instrument [Member] 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] Term loan Term Loan Receivable [Member] Term Loan Receivable Long-term debt Disposal Group, Including Discontinued Operation, Long Term Debt Disposal Group, Including Discontinued Operation, Long Term Debt 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] Schedule Of Securitization Vehicles [Line Items] Schedule Of Securitization Vehicles [Line Items] Schedule Of Securitization Vehicles [Line Items] 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 earnings (losses) attributable to members 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 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] Consolidation Consolidation, Policy [Policy Text Block] 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 Foreign currency forwards, swaps and options Foreign Currency Forwards Swaps And Options [Member] Foreign currency forwards swaps and options. 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). 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] 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] Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Goodwill Disposal Group, Including Discontinued Operation, Goodwill Statement [Table] Statement [Table] Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Interest income Investment Income, Interest Denominator Denominator For Earning For Share, Diluted [Abstract] Denominator For Earning For Share, Diluted Restricted stock units with future service required Restricted Stock Units With Future Service Required [Member] Restricted Stock Units With Future Service Required [Member] Additional amounts available for setoff Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset 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 Fair value, assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Fixed income Fixed Income Services [Member] Fixed Income Services [Member] 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. Forward starting reverse repos Forward Starting Reverse Repos [Member] Forward Starting Reverse Repos [Member] Proceeds from short-term borrowings Proceeds from Short-Term Debt Recoveries collected Accounts Receivable, Allowance for Credit Loss, Recovery Jefferies Capital Partners V L.P. Jefferies Capital Partners V L.P [Member] Jefferies Capital Partners V L.P [Member] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]