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Subsequent Events [Text Block] Rent and occupancy costs Accrued expenses and other current liabilities (Note K) us-gaap_AccruedLiabilitiesCurrent Total accrued expenses and other current liabilities Dividend payable Payroll and other benefits Citi Bank, N.A. [Member] Represents the citi bank member. nath_LineOfCreditFacilityIncrementalBorrowingIncreaseAmount Line of Credit Facility, Incremental Borrowing Increase Amount The additional increase amount of the revolving credit loan. us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: Amount representing interest Long-term portion of operating lease liabilities (Note Q) Operating Lease, Liability, Noncurrent Sales, use and other taxes us-gaap_SalesAndExciseTaxPayableCurrent Options outstanding, weighted average remaining contractual term (Year) us-gaap_OtherAccruedLiabilitiesCurrent Other nath_DebtInstrumentCovenantDebtIssuance Debt Instrument, Covenant, Debt Issuance Represents the percentage of net cash proceed from debt issuance for the covenant terms to voluntarily pay off the loans. Present value of lease liabilities Current portion of operating lease liabilities (Note Q) Operating Lease, Liability, Current nath_DebtInstrumentCovenantEquityIssuance Debt Instrument Covenant, Equity Issuance Represents the percentage of equity issuance during the period. us-gaap_InterestPayableCurrent Interest New Accounting Pronouncements Not yet Adopted [Text Block] The entire disclosure for a new accounting pronouncement not yet adopted. nath_DebtInstrumentPeriodicPaymentPercent Debt Instrument, Periodic Payment, Percent The percent of periodic payments for the debt note. Current portion of long-term debt (Note P) Less: current portion of long-term debt Options exercisable, weighted average remaining contractual term (Year) Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] nath_DebtInstrumentCovenantMaximumConsolidatedNetLeverageRatio Debt Instrument, Covenant, Maximum Consolidated Net Leverage Ratio The maximum consolidated net leverage ratio required under the covenant of the debt instrument. nath_DebtInstrumentCovenantMaximumFixedChargeRatio Debt Instrument, Covenant, Maximum Fixed Charge Ratio The maximum fixed charge ratio required under the covenant of the debt instrument. Asset, Impairment [Text Block] 2029 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo nath_DebtInstrumentCovenantExtraordinaryReceiptsAmount Debt Instrument, Covenant, Extraordinary Receipts, Amount The monetary value of extraordinary receipts related to the debt covenant to voluntarily pay the debt note. Long-term debt, net Long-term debt, net of unamortized debt issuance costs of $239 and $257, respectively (Note P) nath_DebtInstrumentCovenantExtraordinaryReceiptPercentage Debt Instrument, Covenant, Extraordinary Receipt Percentage Represents the percentage of extraordinary receipts the company must reinvest for the debt covenant to voluntarily pay the debt note. 2030 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree 2028 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths nath_DebtInstrumentCovenantDispositionOfCertainIndividualAssetsPercentage Debt Instrument, Covenant, Disposition of Certain Individual Assets, Percentage Represents the percentage of net cash proceeds from the disposition of certain assets individually for the covenant terms for voluntary payment of the loan nath_DebtInstrumentCovenantDispositionOfCertainAssetsIndividuallyAmount Debt Instrument, Covenant, Disposition of Certain Assets Individually, Amount The monetary value of the disposition of cerrtain assets individually in relation to the covenant to voluntarily pay off debt. Total debt, net of debt issuance costs us-gaap_LongTermDebt Statement of Stockholders' Equity [Abstract] Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Statement of Cash Flows [Abstract] Long-Term Debt, Type [Domain] Equity Components [Axis] 2028, net leases Amount of operating lease liability, net of sublease receivable, due in year one. Marketing Represents current prepaid marketing expense. nath_PrepaidRealEstateTaxesExpenseCurrent Real estate taxes Represents current prepaid real estate taxes expense. Equity Component [Domain] Equity [Text Block] Additional Paid-in Capital [Member] Retained Earnings [Member] New deferrals due to cash received and other Represents the amount of additions during the period to the liability from contracts with customers. Cost of sales Property and equipment, net of accumulated depreciation of $12,420 and $12,225, respectively Provision for expected credit losses Subsequent Event Type [Domain] Subsequent Event [Table] Subsequent Event Type [Axis] us-gaap_DeferredIncomeTaxAssetsNet Deferred income taxes Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] Share-based compensation STOCKHOLDERS’ DEFICIT Intangible Asset and Goodwill [Text Block] Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Fair Value Disclosures [Text Block] Share-Based Payment Arrangement, Option [Member] Cash paid during the period for: Franchise Royalties [Member] Represents the franchise royalties. 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Share-Based Payment Arrangement, Activity [Table Text Block] nath_OperatingLeasePaymentsNetSubleaseIncome Operating Lease Payments, Net Sublease Income The amount of cash outflow for operating leases, net cash inflow for sublease income. Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Advertising fund expense Operating Segments [Member] Accounting Policies [Abstract] Segments [Domain] us-gaap_DeferredFinanceCostsGross Less: unamortized debt issuance costs us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Less: allowance for doubtful accounts Beginning balance Ending balance us-gaap_UnamortizedDebtIssuanceExpense Unamortized Debt Issuance Expense Segments [Axis] nath_AccountsReceivablePaymentTerms Accounts Receivable Payment Terms Nathan's standard payment terms. Branded Product Sales [Member] Branded product sales [member] Franchise and License Royalties [Member] Franchise and license royalties [member] Income Statement [Abstract] Other Receivables [Member] Other receivables [member] nath_DeferredLicenseRoyalties Deferred License Royalties The amount of deferred License royalties. Company-operated Restaurants [Member] Represents information about company-operated restaurants. us-gaap_NumberOfReportableSegments Number of Reportable Segments us-gaap_DeferredIncomeTaxExpenseBenefit Deferred income taxes nath_DeferredAdvertisingFund Deferred Advertising Fund The amount of deferred advertising fund. us-gaap_TreasuryStockCommonValue Treasury stock, at cost, 5,289,515 shares at June 28, 2026 and March 29, 2026 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased Share Repurchase Program, Remaining Authorized, Number of Shares Treasury Stock, Common, Shares (in shares) Balance (in shares) Balance (in shares) Treasury Stock, Common [Member] Net income Net income Deferred Revenue [Domain] us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Net income Deferred Revenue Arrangement Type [Axis] Amortization of debt issuance costs COSTS AND EXPENSES us-gaap_OtherNoncashIncomeExpense Operating lease assets and liabilities us-gaap_CostsAndExpenses Total costs and expenses us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Income Tax Disclosure [Text Block] Restricted Stock [Member] Accounting Standards Update and Change in Accounting Principle [Table] us-gaap_TreasuryStockValueAcquiredCostMethod Treasury Stock, Value, Acquired, Cost Method us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1 Finite-Lived Intangible Assets, Remaining Amortization Period (Year) Options exercisable (in shares) us-gaap_RepaymentsOfLongTermDebt Repayment of Credit Facility O 2026 Q1 Dividends [Member] Represents ordinary dividends in Q1 2026. License Royalties and Advertising Fund [Member] Represents license royalties and advertising fund. Merger costs Carrying value as of the balance sheet date of obligations incurred through that date and payable for merger costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Statement of Financial Position [Abstract] Income taxes O 2026 Q4 Dividends [Member] Represents ordinary dividends in Q4 2026. O 2026 Q2 Dividends [Member] Represents ordinary dividends in Q2 2026. O 2026 Q3 Dividends [Member] Represents ordinary dividends in Q3 2026. Other assets dei_DocumentType Document Type us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities Other liabilities Document Information [Line Items] Document Quarterly Report us-gaap_IncreaseDecreaseInOtherNoncurrentAssets Other assets Weighted average remaining lease term (years): (Year) Document Information [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) Deferred revenue us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount dei_EntityInteractiveDataCurrent Entity Interactive Data Current Document Transition Report us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Diluted (in shares) Weighted average diluted shares outstanding (in shares) Net income per share: us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Effect of dilutive share-based awards (in shares) Weighted average basic shares outstanding (in shares) us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Basic (in shares) us-gaap_DebtInstrumentTerm Debt Instrument, Term us-gaap_EarningsPerShareBasic Basic (in dollars per share) us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Effective Income Tax Rate Reconciliation [Table] Title and Position [Domain] Intangible asset, net (Note I) Shares issued in connection with share-based compensation plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares) Document Fiscal Period Focus Shares issued in connection with share-based compensation plans Document Fiscal Year Focus Depreciation and amortization Amendment Flag Common Stock [Member] us-gaap_SubleaseIncome Less: Sublease income, net Goodwill Document Period End Date us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross us-gaap_VariableLeaseCost Variable lease cost Legal Entity [Axis] us-gaap_OperatingLeaseCost Operating lease cost us-gaap_LeaseCost Total net lease cost Business Combination [Domain] dei_EntityFileNumber Entity File Number Revenue recognition Entity Tax Identification Number Business Combination [Axis] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name dei_EntityCurrentReportingStatus Entity Current Reporting Status Business Combination [Table] Entity Incorporation, State or Country Code Current Fiscal Year End Date Leases, Cash Flows [Table Text Block] The tabular disclosure for cash flows on leases. Deferred franchise fees Amount of obligation to transfer good or service to customer for which consideration is receivable. Excludes the amount of cash received. Leases, Disclosure [Text Block] The entire disclosure for leases of both the lessee and lessor. Entity Filer Category dei_EntityShellCompany Entity Shell Company Entity Emerging Growth Company Entity Small Business Lessee, Operating Leases, Weighted Average Remaining Lease Term and Discount Rate [Table Text Block] The tabular disclosure for weighted average remaining lease term and weighted-average discount rate for operating leases of the lessee. Income from operations Income from operations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating Lease, Maturity [Table Text Block] The tabular disclosure for maturity of operating lease both as lessee and lessor. Sixth Stock Repurchase Plan [Member] Represents the sixth stock repurchase plan. us-gaap_ContractWithCustomerLiabilityRevenueRecognized Contract with Customer, Liability, Revenue Recognized REVENUES Entity Address, State or Province Entity Address, City or Town us-gaap_InterestExpenseNonoperating Interest expense Retained earnings Entity Address, Address Line One us-gaap_StockholdersEquityBeforeTreasuryStock Stockholders’ equity before treasury stock Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] City Area Code Local Phone Number Entity Address, Postal Zip Code Revenue from Contract with Customer [Text Block] Title of 12(b) Security Cash and Cash Equivalents Disclosure [Text Block] Security Exchange Name Trading Symbol Class of Stock [Axis] Base Rate [Member] 2030, net leases Amount of operating lease liability, net of sublease receivable, due in year three. Variable Rate [Axis] 2029, net leases Amount of operating lease liability, net of sublease receivable, due in year two. Variable Rate [Domain] 2027, net leases Amount of operating lease liability, net of sublease receivable, due in the remainder of the current fiscal year. nath_LeaseOperatingLeaseLiabilityNetOfSubleaseReceivableTotal Total lease commitments, net leases Amount of operating lease liability, net of sublease receivable, due total. dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Earnings Per Share [Text Block] Chief Financial Officer [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] us-gaap_OtherAssetsCurrent Other Chief Executive Officer [Member] Accounts and other receivables, net (Note G) Accounts and other receivables, net Accrued rebates Weighted average shares used in computing net income per share: Corporate income taxes Other general and administration expenses Options exercisable, aggregate intrinsic value Property, Plant, and Equipment [Table] Common Stock, Par or Stated Value Per Share (in dollars per share) Common Stock, Par or Stated Value Per Share Other income, net Receivable [Domain] us-gaap_Assets Total assets Department expenses Amount of travel expense, marketing and trade show expense and certain other overhead expense. 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Merger With Smithfield and Boardwalk [Member] Represents the merger with Smithfield Foods and Boardwalk Merger Sub. Surviving Corporation [Member] Represents the Surviving Corporation. Boardwalk Merger Sub Inc [Member] Represents Boardwalk Merger Sub Inc. nath_PerShareMergerConsideration Per Share Merger Consideration The amount per share that owners of the company's stock will receive as part of the merger consideration. Product Licensing [Member] Represents Product Licensing, an operating segment of the company. Restaurant Operations [Member] Represents Restaurant Operations, an operating segment of the company. us-gaap_StockholdersEquity Total stockholders’ deficit Balance Balance Deferred franchise fees us-gaap_IncreaseDecreaseInContractWithCustomerLiability Branded Product Program [Member] Represents Branded Product Program, an operating segment of the company. nath_MergerCovenantLicensingAgreementTerminationFee Merger, Covenant, Licensing Agreement, Termination Fee The amount of cash termination required to be paid if certain covenants related to the licensing agreement are triggered. nath_MergerCovenantTerminationFee Merger, Covenant, Termination Fee The termination fee in cash that the company would be required to pay if certain termination conditions are met. Restaurant operating expenses nath_MergerRetentionBonus Merger, Retention Bonus The amount of retention bonus required to be paid if certain conditions are met. Stock, Class of Stock [Table] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Operating lease right-of-use assets, net (Note Q) Other liabilities Revenues Revenues ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Commitments and Contingencies