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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Cash flows from operating activities:    
Net income $ 10,166,000us-gaap_NetIncomeLoss $ 7,109,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities    
Insurance gain 0us-gaap_InsuredEventGainLoss (2,801,000)us-gaap_InsuredEventGainLoss
Impairment charge – long-term investment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 400,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
Depreciation and amortization 985,000us-gaap_DepreciationDepletionAndAmortization 845,000us-gaap_DepreciationDepletionAndAmortization
Amortization of bond premium 129,000us-gaap_InvestmentIncomeAmortizationOfPremium 107,000us-gaap_InvestmentIncomeAmortizationOfPremium
Share-based compensation expense 629,000us-gaap_ShareBasedCompensation 530,000us-gaap_ShareBasedCompensation
Provision for doubtful accounts 7,000us-gaap_ProvisionForDoubtfulAccounts 9,000us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes 77,000us-gaap_DeferredIncomeTaxExpenseBenefit 1,194,000us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
Accounts and other receivables, net (3,307,000)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables (2,445,000)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Insurance proceeds received for business interruption claim 718,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Inventories 155,000us-gaap_IncreaseDecreaseInInventories 57,000us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 1,499,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (728,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (327,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (5,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accrued litigation 0nath_IncreaseDecreaseInAccruedLitigation (5,874,000)nath_IncreaseDecreaseInAccruedLitigation
Accounts payable, accrued expenses and other current liabilities (172,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 224,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred franchise fees 79,000us-gaap_IncreaseDecreaseInDeferredRevenue (79,000)us-gaap_IncreaseDecreaseInDeferredRevenue
Other liabilities (124,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (1,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by (used in) operating activities 10,514,000us-gaap_NetCashProvidedByUsedInOperatingActivities (1,458,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Proceeds from maturities of available for sale securities 6,620,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 2,890,000us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Insurance proceeds received for property and equipment 0nath_InsuranceProceedsReceivedForPropertyAndEquipmentPurchases 2,711,000nath_InsuranceProceedsReceivedForPropertyAndEquipmentPurchases
Purchase of available for sale securities (2,521,000)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (2,219,000)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Purchase of property and equipment (695,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,229,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Litigation settlement 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities 6,009,000us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Change in restricted cash 0us-gaap_IncreaseDecreaseInRestrictedCash (135,000)us-gaap_IncreaseDecreaseInRestrictedCash
Net cash provided by investing activities 3,404,000us-gaap_NetCashProvidedByUsedInInvestingActivities 5,027,000us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Income tax benefit on stock option exercises 1,061,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,658,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from exercise of stock options 222,000us-gaap_ProceedsFromStockOptionsExercised 525,000us-gaap_ProceedsFromStockOptionsExercised
Payments of withholding tax on net share settlement of share-based compensation plans (825,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (772,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Repurchase of common stock (1,916,000)us-gaap_PaymentsForRepurchaseOfCommonStock (262,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) provided by financing activities (1,458,000)us-gaap_NetCashProvidedByUsedInFinancingActivities 1,149,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents 12,460,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 4,718,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 22,077,000us-gaap_CashAndCashEquivalentsAtCarryingValue 13,403,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 34,537,000us-gaap_CashAndCashEquivalentsAtCarryingValue 18,121,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for:    
Interest 0us-gaap_InterestPaid 1,099,000us-gaap_InterestPaid
Income taxes $ 4,404,000us-gaap_IncomeTaxesPaid $ 2,542,000us-gaap_IncomeTaxesPaid