Document And Entity Information Note To Financial Statement Details Textual Note C - Revenues 2024, payments operating leases Note D - Income Per Share 2025, payments operating leases Note F - Fair Value Measurements Note G - Accounts and Other Receivables, Net Note H - Prepaid Expenses and Other Current Assets Note K - Accrued Expenses and Other Current Liabilities Note M - Segment Information Note N - Share-based Compensation Note P - Long-term Debt Income Tax Disclosure [Text Block] Note Q - Leases Note C - Revenues - Disaggregation of Revenue (Details) Insurance proceeds for property and equipment Insurance proceeds received for property and equipment purchases due to Hurricane Sandy. 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Note Q - Leases - Future Lease Commitments to Be Paid and Received (Details) Note Q - Leases - Components of Lease Income (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] nath_OperatingLeasePaymentsNetSubleaseIncome Operating Lease Payments, Net Sublease Income The amount of cash outflow for operating leases, net cash inflow for sublease income. 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Branded Product Sales [Member] Branded product sales [member] Franchise and License Royalties [Member] Franchise and license royalties [member] Treasury stock, common shares (in shares) Other Receivables [Member] Other receivables [member] Common stock, $.01 par value; 30,000,000 shares authorized; 9,369,235 shares issued; and 4,079,720 and 4,115,154 shares outstanding at September 25, 2022 and March 27, 2022, respectively Senior Notes [Member] Adjustments to reconcile net income to net cash provided by operating activities us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Options outstanding, weighted average exercise price (in dollars per share) Options outstanding, weighted average exercise price (in dollars per share) Common stock, shares authorized (in shares) Company-operated Restaurants [Member] Represents information about company-operated restaurants. Common stock, shares issued (in shares) Deferred franchise fees us-gaap_ContractWithCustomerLiabilityCurrent Contract with Customer, Liability, Current Franchise Fees and Royalties [Member] Information related to franchise fees and royalties. Common stock, par value (in dollars per share) Sales, use and other taxes us-gaap_SalesAndExciseTaxPayableCurrent Goodwill and Intangible Assets Disclosure [Text Block] 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 Operating cash flows from operating leases us-gaap_InterestPayableCurrent Interest nath_DilutiveSecuritiesEffectOnEarningsPerShare Effect of dilutive employee stock options (in dollars per share) The effect on EPS of the additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share-based payment arrangement using the treasury stock method. Accounts payable Product and Service [Axis] us-gaap_OtherAssetsCurrent Other us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Options outstanding (in shares) Options outstanding (in shares) Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Product and Service [Domain] us-gaap_OtherAccruedLiabilitiesCurrent Other Interest us-gaap_PolicyTextBlockAbstract Accounting Policies Thereafter, payments operating leases Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Geographical [Axis] Thereafter, receipts subleases Amount of lease payment to be received by lessor for operating lease after fourth fiscal year following current fiscal year. 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Non-cash financing activity: Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Income taxes CURRENT LIABILITIES Product [Member] Asset Impairment Charges [Text Block] us-gaap_Assets Total assets Branded Products [Member] Represents information about branded products. Long-term debt, fair value us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Cash flows from operating activities: Other Current Assets [Text Block] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) Accounts and other receivables, net (Note G) Accounts and other receivables, net us-gaap_SubleaseIncome Less: Sublease income, net us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Net income, basic calculation Contract with Customer, Deferred Franchise Fees [Table Text Block] Tabular disclosure of significant changes in deferred franchises fees. Schedule of Segment Reporting Information, by Segment [Table Text Block] us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted Net income, diluted calculation Statement [Line Items] Accounts receivable, gross, current Less: allowance for doubtful accounts Balance Balance us-gaap_OperatingLeaseLeaseIncome Operating lease income, net us-gaap_DeferredIncomeTaxAssetsNet Deferred income taxes REVENUES Share-Based Payment Arrangement [Text Block] Additional paid-in capital us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation Withholding tax on net share settlement of share-based compensation plans STOCKHOLDERS’ DEFICIT Receivables, which are included in “Accounts and other receivables, net” (a) nath_PaymentsOfOrdinaryDividendsAndSpecialDividends Dividends paid to stockholders Amount of cash outflow in the form of ordinary and special dividends to common shareholders of the parent entity. Other income, net Segment Reporting Disclosure [Text Block] Award Type [Domain] CURRENT ASSETS Fair Value Disclosures [Text Block] Net income Net income Award Type [Axis] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Intangible asset, net (Note I) License [Member] Interest income us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash and cash equivalents us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities us-gaap_Liabilities Total liabilities Restricted Stock [Member] COMMITMENTS AND CONTINGENCIES (Note R) Income from operations us-gaap_OperatingIncomeLoss Income from operations us-gaap_ContractWithCustomerLiabilityRevenueRecognized Contract with Customer, Liability, Revenue Recognized Revenue recognized during the period us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Share-Based Payment Arrangement, Option [Member] us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Prepaid expenses and other current assets (Note H) Total prepaid expenses and other current assets Cost of sales Consolidation Items [Domain] Commitments and Contingencies Disclosure [Text Block] Property and equipment accumulated depreciation us-gaap_ContractWithCustomerLiability Deferred franchise fees, balance Deferred franchise fees, balance Property and equipment, net of accumulated depreciation of $10,694 and $10,344, respectively Goodwill Consolidation Items [Axis] us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total Long-Term Debt, Type [Axis] Long-Term Debt, Type [Domain] us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Payments of withholding tax on net share settlement of share-based compensation plans Advertising Fund Revenue [Member] Revenue from advertising fund. us-gaap_CostsAndExpenses Total costs and expenses Cash flows from investing activities: us-gaap_PaymentsForRepurchaseOfCommonStock Repurchase of treasury stock COSTS AND EXPENSES Income per share: Retained Earnings [Member] Earnings Per Share [Text Block] Revenues Revenues us-gaap_TreasuryStockAcquiredAverageCostPerShare Treasury Stock Acquired, Average Cost Per Share (in dollars per share) Treasury Stock [Member] us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) Accounts payable, accrued expenses and other current liabilities us-gaap_DeferredFinanceCostsGross Less: unamortized debt issuance costs Additional Paid-in Capital [Member] Share Repurchase Program [Domain] Common Stock [Member] Provision for income taxes Income Tax Expense (Benefit), Total us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) Equity Components [Axis] Share Repurchase Program [Axis] Equity Component [Domain] us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1 Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total Income before provision for income taxes Deferred Revenue Arrangement Type [Axis] Deferred Revenue [Domain] Restaurant Operating Expense [Member] Primary financial statement caption encompassing restaurant operating expense. New Accounting Pronouncements Not yet Adopted [Text Block] The entire disclosure for a new accounting pronouncement not yet adopted. Deferred revenue Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] General and administrative expenses Leases, Cash Flows [Table Text Block] The tabular disclosure for cash flows on leases. us-gaap_CashEquivalentsAtCarryingValue Cash Equivalents, at Carrying Value, Total Deferred franchise fees (b) 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. Cash and cash equivalents (Note E) us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities Other liabilities 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] Share-based compensation expense Share-Based Payment Arrangement, Expense 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. Cash paid during the period for: Sixth Stock Repurchase Plan [Member] Represents the sixth stock repurchase plan. Document Quarterly Report Amendment Flag Entity Incorporation, State or Country Code Long-term debt, face value General and Administrative Expense [Member] us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounting Policies [Abstract] Document Transition Report City Area Code Entity Interactive Data Current Dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared (in dollars per share) Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired (in shares) Deferred franchise fees Security Exchange Name Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Title of 12(b) Security 2024, net leases Amount of operating lease liability, net of sublease receivable, due in year one. Current Fiscal Year End Date Interest Rate Receivable Type [Axis] Variable lease cost Receivable [Domain] Marketing Represents current prepaid marketing expense. Total net lease cost Real estate taxes Represents current prepaid real estate taxes expense. us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other current assets Other Income [Member] Weighted average discount rate: 2027, net leases Amount of operating lease liability, net of sublease receivable, due in year four. 2026, net leases Amount of operating lease liability, net of sublease receivable, due in year three. Document Fiscal Period Focus Operating lease cost 2025, net leases Amount of operating lease liability, net of sublease receivable, due in year two. Document Fiscal Year Focus 2023, net leases Amount of operating lease liability, net of sublease receivable, due in the remainder of the current fiscal year. Lease, Cost [Table Text Block] nath_LeaseOperatingLeaseLiabilityNetOfSubleaseReceivableTotal Total lease commitments, net leases Amount of operating lease liability, net of sublease receivable, due total. Document Period End Date Income Statement Location [Axis] Weighted average remaining lease term (years): (Year) Income Statement Location [Domain] Entity File Number New deferrals due to cash received and other Represents the amount of additions during the period to the liability from contracts with customers. Entity Emerging Growth Company Senior Secured 2025 Notes [Member] Related to the senior secured notes maturing in 2025. Document Type Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Entity Small Business Entity Shell Company us-gaap_DividendsCommonStockCash Dividends on common stock Document Information [Line Items] Document Information [Table] Franchisor Disclosure [Axis] Entity Filer Category Franchisor Disclosure [Domain] Debt Instrument [Axis] Entity Current Reporting Status Debt Instrument, Name [Domain] Segments [Axis] Segments [Domain] us-gaap_LessorOperatingLeasePaymentsToBeReceived Total lease commitments, receipts subleases us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Number of shares, diluted calculation (in shares) us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Diluted (in shares) Share-based compensation us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables Accounts and other receivables, net 2023, receipts subleases Entity Tax Identification Number Non-US [Member] Entity Central Index Key Weighted average shares used in computing income per share: 2024, receipts subleases Entity Registrant Name 2025, receipts subleases 2026, receipts subleases 2027, receipts subleases Entity [Domain] Legal Entity [Axis] Statement [Table] Entity Address, Address Line One Statement of Financial Position [Abstract] Net income per share, diluted calculation (in dollars per share) us-gaap_EarningsPerShareDiluted Diluted (in dollars per share) Number of shares, basic calculation (in shares) us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Basic (in shares) us-gaap_TreasuryStockValueAcquiredCostMethod Treasury Stock, Value, Acquired, Cost Method Repurchase of common stock Entity Address, City or Town us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent, Total Entity Address, Postal Zip Code Net income per share, basic calculation (in dollars per share) us-gaap_EarningsPerShareBasic Basic (in dollars per share) Entity Address, State or Province Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] us-gaap_TreasuryStockValue Treasury stock, at cost, 5,289,515 and 5,254,081 shares at September 25, 2022 and March 27, 2022 Statement of Cash Flows [Abstract] Entity Common Stock, Shares Outstanding Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] Advertising fund expense Revenue from External Customers by Geographic Areas [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] us-gaap_IncreaseDecreaseInOtherNoncurrentAssets Other assets Operating Lease, Lease Income [Table Text Block] Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] us-gaap_IncreaseDecreaseInInventories Inventories Franchise Royalties [Member] Represents the franchise royalties. Trading Symbol nath_CostOfProductIncreasePercent Cost of Product, Increase, Percent Amount of increase of cost of product as a percentage. Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Local Phone Number us-gaap_GainLossOnDispositionOfAssets Gain on disposal of property and equipment us-gaap_TableTextBlock Notes Tables Plan 10b5-1 [Member] Represents 10b5-1 Plan. Shares issued in connection with share-based compensation plans (in shares) Shares issued in connection with share-based compensation plans Bad debt expense Provision for doubtful accounts Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Cash flows from financing activities: Other liabilities Restaurant operating expenses us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ deficit UNITED STATES Corporate, Non-Segment [Member] Changes in operating assets and liabilities: Accumulated deficit Product Licensing [Member] Represents Product Licensing, an operating segment of the company. Debt Disclosure [Text Block] us-gaap_InterestExpenseOther Interest expense 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. Deferred franchise fees us-gaap_ContractWithCustomerLiabilityNoncurrent Contract with Customer, Liability, Noncurrent us-gaap_StockholdersEquity Total stockholders’ deficit Balance Balance Amortization of debt issuance costs us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_OtherNoncashIncomeExpense Other non-cash items Subsequent Event [Member] Operating lease liabilities (Note Q) Operating Lease, Liability, Noncurrent Class of Stock [Axis] Long-term debt, net Long-term debt, net of unamortized debt issuance costs of $1,563 and $1,817, respectively (Note P) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Present value of lease liabilities, payments operating leases Subsequent Event Type [Axis] Current portion of operating lease liabilities (Note Q) Operating Lease, Liability, Current Cash and Cash Equivalents Disclosure [Text Block] Subsequent Event Type [Domain] Virtual Kitchens [Member] Represents virtual kitchens. Subsequent Events [Text Block] Operating Segments [Member] Operating lease assets (Note Q) Long-term debt, unamortized debt costs us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease commitments, payments operating leases Less: Amount representing interest, payments operating leases us-gaap_DeferredIncomeTaxExpenseBenefit Deferred income taxes 2026, payments operating leases 2027, payments operating leases