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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Cash flows from operating activities:      
Net income $ 11,703,000us-gaap_NetIncomeLoss $ 8,327,000us-gaap_NetIncomeLoss $ 7,468,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 1,253,000us-gaap_DepreciationDepletionAndAmortization 1,157,000us-gaap_DepreciationDepletionAndAmortization 940,000us-gaap_DepreciationDepletionAndAmortization
Insurance gain 0us-gaap_InsuredEventGainLoss (2,774,000)us-gaap_InsuredEventGainLoss 0us-gaap_InsuredEventGainLoss
Amortization of bond premium 164,000us-gaap_InvestmentIncomeAmortizationOfPremium 150,000us-gaap_InvestmentIncomeAmortizationOfPremium 130,000us-gaap_InvestmentIncomeAmortizationOfPremium
Amortization of debt discounts and issuance costs 66,000us-gaap_AmortizationOfFinancingCosts    
Share-based compensation expense 859,000us-gaap_ShareBasedCompensation 721,000us-gaap_ShareBasedCompensation 627,000us-gaap_ShareBasedCompensation
Provision for doubtful accounts 23,000us-gaap_ProvisionForDoubtfulAccounts 21,000us-gaap_ProvisionForDoubtfulAccounts 15,000us-gaap_ProvisionForDoubtfulAccounts
Cost-method Investments, Other than Temporary Impairment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 400,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
Deferred income taxes 111,000us-gaap_DeferredIncomeTaxExpenseBenefit 1,652,000us-gaap_DeferredIncomeTaxExpenseBenefit 497,000us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:      
Accounts and other receivables, net (2,417,000)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables (927,000)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables (397,000)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Insurance proceeds received for business interruption claim 718,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Inventories 125,000us-gaap_IncreaseDecreaseInInventories 99,000us-gaap_IncreaseDecreaseInInventories 79,000us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (1,403,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (2,033,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 298,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets 181,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 30,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 7,000us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accrued litigation 0nath_IncreaseDecreaseInAccruedLitigation (5,874,000)nath_IncreaseDecreaseInAccruedLitigation 455,000nath_IncreaseDecreaseInAccruedLitigation
Accounts payable, accrued expenses and other current liabilities 1,779,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 2,329,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (838,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Advances of insurance proceeds     130,000nath_AdvancesOfInsuranceProceeds
Deferred franchise fees 44,000us-gaap_IncreaseDecreaseInDeferredRevenue (44,000)us-gaap_IncreaseDecreaseInDeferredRevenue 155,000us-gaap_IncreaseDecreaseInDeferredRevenue
Other liabilities 79,000us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (358,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (72,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities 13,285,000us-gaap_NetCashProvidedByUsedInOperatingActivities 2,876,000us-gaap_NetCashProvidedByUsedInOperatingActivities 9,494,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Proceeds from sales and maturities of available-for-sale securities 8,020,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 2,890,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 2,000,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Insurance proceeds received for property and equipment (Note M.4) 0nath_InsuranceProceedsReceivedForPropertyAndEquipmentPurchases 2,711,000nath_InsuranceProceedsReceivedForPropertyAndEquipmentPurchases 449,000nath_InsuranceProceedsReceivedForPropertyAndEquipmentPurchases
Purchase of long-term investment     (500,000)us-gaap_PaymentsToAcquireLongtermInvestments
Change in restricted cash 0us-gaap_IncreaseDecreaseInRestrictedCash (135,000)us-gaap_IncreaseDecreaseInRestrictedCash (455,000)us-gaap_IncreaseDecreaseInRestrictedCash
Purchase of property and equipment (1,538,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,339,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (998,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of available-for-sale securities (4,258,000)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (2,219,000)us-gaap_PaymentsToAcquireAvailableForSaleSecurities  
Litigation settlement 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 6,009,000us-gaap_PaymentsForProceedsFromOtherInvestingActivities  
Net cash provided by investing activities 2,224,000us-gaap_NetCashProvidedByUsedInInvestingActivities 4,917,000us-gaap_NetCashProvidedByUsedInInvestingActivities 496,000us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 135,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt    
Debt discounts and issuance costs (5,926,000)us-gaap_PaymentsOfDebtIssuanceCosts    
Dividends paid to stockholders (115,110,000)us-gaap_PaymentsOfDividendsCommonStock    
Repurchase of treasury stock (1,916,000)us-gaap_PaymentsForRepurchaseOfCommonStock (1,486,000)us-gaap_PaymentsForRepurchaseOfCommonStock (3,085,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from the exercise of stock options 880,000us-gaap_ProceedsFromStockOptionsExercised 944,000us-gaap_ProceedsFromStockOptionsExercised 389,000us-gaap_ProceedsFromStockOptionsExercised
Income tax benefit on stock option exercises 4,572,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 2,195,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,062,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payments of withholding tax on net share settlement of share-based compensation plans (3,693,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (772,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (982,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net cash provided by (used in) financing activities 13,807,000us-gaap_NetCashProvidedByUsedInFinancingActivities 881,000us-gaap_NetCashProvidedByUsedInFinancingActivities (2,616,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents 29,316,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 8,674,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 7,374,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 22,077,000us-gaap_CashAndCashEquivalentsAtCarryingValue 13,403,000us-gaap_CashAndCashEquivalentsAtCarryingValue 6,029,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 51,393,000us-gaap_CashAndCashEquivalentsAtCarryingValue 22,077,000us-gaap_CashAndCashEquivalentsAtCarryingValue 13,403,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for:      
Interest 0us-gaap_InterestPaid 1,099,000us-gaap_InterestPaid  
Income taxes $ 4,545,000us-gaap_IncomeTaxesPaid $ 3,457,000us-gaap_IncomeTaxesPaid $ 2,548,000us-gaap_IncomeTaxesPaid