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Sales, use and other taxes us-gaap_SalesAndExciseTaxPayableCurrent Goodwill and Intangible Assets Disclosure [Text Block] Granted, weighted average exercise price (in dollars per share) Exercised, weighted average exercise price (in dollars per share) Accrued expenses and other current liabilities (Note K) us-gaap_AccruedLiabilitiesCurrent Total accrued expenses and other current liabilities Payroll and other benefits Corporate income taxes us-gaap_InterestPayableCurrent Interest Accounts payable us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Options outstanding (in shares) Options outstanding (in shares) Revolving Credit Facility [Member] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Credit Facility [Axis] Credit Facility [Domain] us-gaap_OtherAccruedLiabilitiesCurrent Other us-gaap_PolicyTextBlockAbstract Accounting Policies Professional fees Accrued rebates Rent and occupancy costs us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property and equipment us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Effect of dilutive share-based awards (in shares) Deferred Franchise Fees And Other Deferred Revenue [Member] Represents deferred franchise fees and other deferred revenue. Weighted average shares used in computing net income per share: Income taxes nath_ContractWithCustomerLiabilityAmountOfRevenueRecognized Revenue recognized during the period Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] CURRENT LIABILITIES Asset Impairment Charges [Text Block] us-gaap_Assets Total assets Cash paid during the period for: Branded Products [Member] Represents information about branded products. Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Net income Other Current Assets [Text Block] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) us-gaap_SubleaseIncome Less: Sublease income, net Contract with Customer, Deferred Franchise Fees [Table Text Block] Tabular disclosure of significant changes in deferred franchises fees. Operating lease income, net Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] us-gaap_DeferredIncomeTaxAssetsNet Deferred income taxes Share-Based Payment Arrangement [Text Block] us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation Withholding tax on net share settlement of share-based compensation plans nath_PaymentsOfOrdinaryDividendsAndSpecialDividends Dividends paid to stockholders Payments Of Ordinary Dividends and Special Dividends Amount of cash outflow in the form of ordinary and special dividends to common shareholders of the parent entity. Award Type [Domain] Effective Income Tax Rate Reconciliation [Table] Net income Net income Award Type [Axis] Intangible asset, net (Note I) Restricted Stock [Member] Share-Based Payment Arrangement, Option [Member] Commitments and Contingencies Disclosure [Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net of accumulated depreciation of $12,859 and $12,295, respectively Goodwill Long-Term Debt, Type [Axis] Long-Term Debt, Type [Domain] Medium-Term Note [Member] Advertising Fund Revenue [Member] Revenue from advertising fund. Cash flows from investing activities: Net income per share: Earnings Per Share [Text Block] Accounts payable, accrued expenses and other current liabilities us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities us-gaap_DeferredFinanceCostsGross Less: unamortized debt issuance costs Provision for income taxes Income Tax Expense (Benefit) Term Loan [Member] Represents the term loan agreement. 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. 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. nath_DebtInstrumentCovenantEquityIssuance Debt Instrument Covenant, Equity Issuance Represents the percentage of equity issuance during the period. us-gaap_DebtInstrumentTerm Debt Instrument, Term 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. Other general and administration expenses General and administrative expenses 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. us-gaap_CashEquivalentsAtCarryingValue Cash Equivalents, at Carrying Value 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. Cash and cash equivalents (Note E) 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. us-gaap_InterestExpenseNonoperating Interest expense us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities Other liabilities Payroll expense Stock options Share-Based Payment Arrangement, Expense 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. 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Entity Emerging Growth Company us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Senior Secured 2025 Notes [Member] Related to the senior secured notes maturing in 2025. dei_DocumentType Document Type Loss on debt extinguishment (Note P) Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Entity Small Business dei_EntityShellCompany Entity Shell Company us-gaap_DividendsCommonStockCash Dividends on common stock Document Information [Line Items] Document Information [Table] Entity Filer Category Debt Instrument [Axis] dei_EntityCurrentReportingStatus Entity Current Reporting Status Debt Instrument, Name [Domain] Variable Rate [Domain] us-gaap_LessorOperatingLeasePaymentsToBeReceived Total lease commitments, receipts subleases Schedule of Long-Term Debt Instruments [Table] Variable Rate [Axis] Share-based compensation us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables Accounts and other receivables, net 2026, receipts subleases Entity Tax Identification Number Entity Central Index Key Depreciation and amortization 2027, receipts subleases dei_EntityRegistrantName Entity Registrant Name 2028, receipts subleases 2029, receipts subleases 2030, receipts subleases Entity [Domain] Legal Entity [Axis] Entity Address, Address Line One us-gaap_TreasuryStockValueAcquiredCostMethod Treasury Stock, Value, Acquired, Cost Method Non-Rule 10b5-1 Arrangement Terminated [Flag] Entity Address, City or Town Rule 10b5-1 Arrangement Terminated [Flag] Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code us-gaap_TreasuryStockCommonValue Treasury stock, at cost, 5,289,515 shares at December 28, 2025 and March 30, 2025, respectively Entity Address, State or Province Non-Rule 10b5-1 Arrangement Adopted [Flag] Material Terms of Trading Arrangement [Text Block] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Trading Arrangements, by Individual [Table] Advertising fund expense us-gaap_IncreaseDecreaseInOtherNoncurrentAssets Other assets Operating Lease, Lease Income [Table Text Block] us-gaap_IncreaseDecreaseInInventories Inventories Franchise Royalties [Member] Represents the franchise royalties. Trading Symbol Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Local Phone Number us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised Exercised (in shares) us-gaap_TableTextBlock Notes Tables us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Shares issued in connection with share-based compensation plans (in shares) Shares issued in connection with share-based compensation plans Provision for expected credit losses Secured Overnight Financing Rate (SOFR) [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Line of Credit Facility, Lender [Domain] Restaurant operating expenses Lender Name [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ deficit UNITED STATES Retained earnings Debt Disclosure [Text Block] Changes in operating assets and liabilities: Amortization of debt issuance costs us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_OtherNoncashIncomeExpense Operating lease assets and liabilities Long-term portion of operating lease liabilities (Note Q) Operating Lease, Liability, Noncurrent Subsequent Event [Member] Cash and Cash Equivalent [Table] Present value of lease liabilities Subsequent Event [Table] Current portion of operating lease liabilities (Note Q) Operating Lease, Liability, Current Subsequent Event Type [Axis] Cash and Cash Equivalents Disclosure [Text Block] Subsequent Event Type [Domain] Subsequent Events [Text Block] Operating lease right-of-use assets, net (Note Q) Unamortized Debt Issuance Expense us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease commitments, payments operating leases us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less: Amount representing interest us-gaap_DeferredIncomeTaxExpenseBenefit Deferred income taxes 2029, payments operating leases 2030, payments operating leases 2027, payments operating leases 2028, payments operating leases Other assets us-gaap_ShareBasedCompensation Share-based compensation expense us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1 Finite-Lived Intangible Assets, Remaining Amortization Period (Year) 2026, payments operating leases Intangible Asset, Finite-Lived [Table] nath_AccountsReceivableAllowanceForCreditLossWriteoffRecovery Write offs and other Amount of direct write-downs (recovery) of accounts receivable charged against the allowance. Depreciation and amortization us-gaap_DepreciationDepletionAndAmortization nath_OperatingLeasePaymentsNetSubleaseIncome Operating Lease Payments, Net Sublease Income The amount of cash outflow for operating leases, net cash inflow for sublease income. us-gaap_StockholdersEquityBeforeTreasuryStock Stockholders’ equity before treasury stock us-gaap_AssetsCurrent Total current assets Equity [Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] nath_AccountsReceivablePaymentTerms Accounts Receivable Payment Terms Nathan's standard payment terms. Treasury Stock, Common, Shares (in shares) Balance (in shares) Balance (in shares) Branded Product Sales [Member] Branded product sales [member] Franchise and License Royalties [Member] Franchise and license royalties [member] Other Receivables [Member] Other receivables [member] Common stock, $.01 par value; 30,000,000 shares authorized; 9,383,920 and 9,379,025 shares issued; and 4,094,405 and 4,089,510 shares outstanding at December 28, 2025 and March 30, 2025, respectively Senior Notes [Member] Adjustments to reconcile net income to net cash provided by operating activities: nath_DeferredLicenseRoyalties Deferred License Royalties The amount of deferred License royalties. Common Stock, Shares Authorized (in shares) Company-operated Restaurants [Member] Represents information about company-operated restaurants. Common Stock, Shares, Issued (in shares) nath_DeferredAdvertisingFund Deferred Advertising Fund The amount of deferred advertising fund. Common Stock, Par or Stated Value Per Share (in dollars per share) Common Stock, Par or Stated Value Per Share Lessee, Lease, Description [Table] Operating cash flows from operating leases Product and Service [Axis] us-gaap_OtherAssetsCurrent Other Product and Service [Domain] us-gaap_PrepaidTaxes Income taxes Interest Geographical [Axis] Geographical [Domain] Inventories Insurance O2025Q2 Dividends [Member] Represents the dividends for the second quarter. O2025Q1 Dividends [Member] The first quarter dividends. O2025Q3 Dividends [Member] Represents the dividends for the third quarter. Cash flows from operating activities: O2025Q4 Dividends [Member] Represents ordinary dividends in the fourth quarter of fiscal year 2025. Accounts and other receivables, net (Note G) Accounts and other receivables, net Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Statement [Line Items] Accounts receivable, gross, current us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Less: allowance for doubtful accounts Beginning balance Ending balance us-gaap_NumberOfReportableSegments Number of Reportable Segments REVENUES Additional paid-in capital STOCKHOLDERS’ DEFICIT Property, Plant and Equipment [Table] Other income, net Segment Reporting Disclosure [Text Block] Chief Financial Officer [Member] License Royalties and Advertising Fund [Member] Represents license royalties and advertising fund. Chief Executive Officer [Member] CURRENT ASSETS Fair Value Disclosures [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period License [Member] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash and cash equivalents Interest and dividend income us-gaap_Liabilities Total liabilities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities Commitments and Contingencies Income (loss) from operations Income from operations us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities us-gaap_ContractWithCustomerLiabilityRevenueRecognized Contract with Customer, Liability, Revenue Recognized Prepaid expenses and other current assets (Note H) Total prepaid expenses and other current assets us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Segment gross profit Cost of sales Base Rate [Member] Consolidation Items [Domain] Deferred revenues, which are included in “Accrued expenses and other current liabilities” us-gaap_ContractWithCustomerLiability Deferred franchise fees at beginning of period Deferred franchise fees at end of period Consolidation Items [Axis] us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Payments of withholding tax on net share settlement of share-based compensation plans Condensed Balance Sheet Statement [Table] us-gaap_CostsAndExpenses Total costs and expenses COSTS AND EXPENSES Retained Earnings [Member] Revenues Title and Position [Domain] Title and Position [Axis] Treasury Stock, Common [Member] us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased Share Repurchase Program, Remaining Authorized, Number of Shares nath_OperatingLeaseSettlementIncome Operating Lease, Settlement Income Amount of settlement income resulting from the termination of an operating lease. Additional Paid-in Capital [Member] Common Stock [Member] Equity Components [Axis] Equity Component [Domain] Total debt, net of debt issuance costs us-gaap_LongTermDebt Stock, Class of Stock [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) Revenue recognition Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Income (loss) before provision for income taxes Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Deferred Revenue Arrangement Type [Axis] Deferred Revenue [Domain] Restaurant Operating Expense [Member] Primary financial statement caption encompassing restaurant operating expense. Deferred revenue Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] us-gaap_LineOfCredit Long-Term Line of Credit us-gaap_PaymentsOfDebtIssuanceCosts Debt issuance costs 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. 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. Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] us-gaap_DeferredFinanceCostsNoncurrentGross Debt Issuance Cost, Gross, Noncurrent us-gaap_RepaymentsOfLongTermDebt Repayment of Credit Facility Repayments of Long-Term Debt Revenue from Contract with Customer [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. Document Quarterly Report Entity Incorporation, State or Country Code Long-term Debt Total General and Administrative Expense [Member] us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounting Policies [Abstract] Document Transition Report us-gaap_RepaymentsOfSeniorDebt Repayment of Senior Secured Notes dei_EntityInteractiveDataCurrent Entity Interactive Data Current us-gaap_CommonStockDividendsPerShareDeclared Common Stock, Dividends, Per Share, Declared us-gaap_CommonStockDividendsPerShareCashPaid Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) Security Exchange Name Title of 12(b) Security Proceeds from Credit Facility Receivable Type [Axis] Receivable [Domain] Other Income [Member] 2030, net leases Amount of operating lease liability, net of sublease receivable, due in year four. 2029, net leases Amount of operating lease liability, net of sublease receivable, due in year three. 2028, net leases Amount of operating lease liability, net of sublease receivable, due in year two. 2026, 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. Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Domain] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Accounts and Financing Receivables [Table] Segments [Axis] Segments [Domain] us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Anti-dilutive share-based awards (in shares) us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Diluted (in shares) Weighted average diluted shares outstanding (in shares) Non-US [Member] Statement [Table] Statement of Financial Position [Abstract] us-gaap_EarningsPerShareDiluted Diluted (in dollars per share) Weighted average basic shares outstanding (in shares) us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Basic (in shares) us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent us-gaap_EarningsPerShareBasic Basic (in dollars per share) Business Combination [Axis] Business Combination [Domain] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Statement of Cash Flows [Abstract] Department expenses Amount of travel expense, marketing and trade show expense and certain other overhead expense. Remainder of 2026 Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] 2029 2030 Revenue from External Customers by Geographic Areas [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] 2027 2028 Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Accounting Standards Update and Change in Accounting Principle [Table] Share Repurchase Program [Domain] Share Repurchase Program [Axis] Other Commitments [Table] Cash flows from financing activities: srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased Share Repurchase Program, Authorized, Number of Shares Other liabilities Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Dividends [Axis] Dividends [Domain] nath_PerShareMergerConsiderationShares Per Share Merger Consideration, Shares The number of shares converted during a merger. 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. 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. Deferred franchise fees us-gaap_ContractWithCustomerLiabilityNoncurrent Contract with Customer, Liability, Noncurrent us-gaap_StockholdersEquity Total stockholders’ deficit Balance Balance nath_MergerRetentionBonus Merger, Retention Bonus The amount of retention bonus required to be paid if certain conditions are met. Class of Stock [Axis] Long-term debt, net Long-term debt, net of unamortized debt issuance costs of $274 and $327, respectively (Note P) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating Segments [Member]