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Note B - Summary of Significant Accounting Policies (Details Textual) (USD $)
12 Months Ended 5 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Mar. 31, 2013
Goodwill and Intangible Asset Impairment $ 0us-gaap_GoodwillAndIntangibleAssetImpairment $ 0us-gaap_GoodwillAndIntangibleAssetImpairment    
Impairment of Long-Lived Assets Held-for-use 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse  
Cash Equivalents, at Carrying Value 1,754,000us-gaap_CashEquivalentsAtCarryingValue 330,000us-gaap_CashEquivalentsAtCarryingValue    
Goodwill 95,000us-gaap_Goodwill 95,000us-gaap_Goodwill    
Intangible Assets, Net (Excluding Goodwill) 1,353,000us-gaap_IntangibleAssetsNetExcludingGoodwill 1,353,000us-gaap_IntangibleAssetsNetExcludingGoodwill    
Loss from Catastrophes     1,340,000us-gaap_LossFromCatastrophes  
Long-term Debt, Gross 135,000,000us-gaap_DebtInstrumentCarryingAmount      
Long-term Debt, Fair Value 141,835,000us-gaap_LongTermDebtFairValue      
Franchise Revenue 5,581,000us-gaap_FranchiseRevenue 5,718,000us-gaap_FranchiseRevenue 5,842,000us-gaap_FranchiseRevenue  
Maximum Contributions to Advertising Fund Percentage of Net Sales 2.00%nath_MaximumContributionsToAdvertisingFundPercentageOfNetSales      
Advertising Expense 175,000us-gaap_AdvertisingExpense 147,000us-gaap_AdvertisingExpense 144,000us-gaap_AdvertisingExpense  
Write Off of Property and Equipment [Member]        
Loss from Catastrophes     449,000us-gaap_LossFromCatastrophes
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_WriteOffOfPropertyAndEquipmentMember
449,000us-gaap_LossFromCatastrophes
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_WriteOffOfPropertyAndEquipmentMember
Deferred Franchise Fees [Member]        
Deferred Revenue, Current 278,000us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nath_DeferredFranchiseFeesMember
234,000us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nath_DeferredFranchiseFeesMember
   
Deferred Development Fee [Member]        
Deferred Revenue 214,000us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nath_DeferredDevelopmentFeeMember
200,000us-gaap_DeferredRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nath_DeferredDevelopmentFeeMember
   
New Unit Openings, Transfers, Co-branding, and Forfeitures [Member]        
Franchise Revenue $ 1,043,000us-gaap_FranchiseRevenue
/ us-gaap_FranchisorDisclosureAxis
= nath_NewUnitOpeningsTransfersCobrandingAndForfeituresMember
$ 863,000us-gaap_FranchiseRevenue
/ us-gaap_FranchisorDisclosureAxis
= nath_NewUnitOpeningsTransfersCobrandingAndForfeituresMember
$ 852,000us-gaap_FranchiseRevenue
/ us-gaap_FranchisorDisclosureAxis
= nath_NewUnitOpeningsTransfersCobrandingAndForfeituresMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Branded Product Customer A [Member]        
Concentration Risk, Percentage 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerAMember
23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerAMember
16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerAMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Branded Product Customer B [Member]        
Concentration Risk, Percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerBMember
13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerBMember
11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerBMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Branded Product Customer C [Member]        
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerCMember
11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerCMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerCMember
 
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Retail Licensee [Member]        
Concentration Risk, Percentage     18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_OneRetailLicenseeMember
 
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Branded Product Customer A [Member]        
Concentration Risk, Percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerAMember
17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerAMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_BrandedProductCustomerAMember
 
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | One Retail Licensee [Member]        
Concentration Risk, Percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nath_OneRetailLicenseeMember
     
Cost of Goods, Product Line [Member] | Supplier Concentration Risk [Member] | Primary Supplier of Hot Dogs [Member]        
Concentration Risk, Percentage 83.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= nath_PrimarySupplierOfHotDogsMember
75.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= nath_PrimarySupplierOfHotDogsMember
82.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= nath_PrimarySupplierOfHotDogsMember
 
Cost of Goods, Product Line [Member] | Supplier Concentration Risk [Member] | Distributor of Product to Company-owned Restaurants [Member]        
Concentration Risk, Percentage 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= nath_DistributorOfProductToCompanyownedRestaurantsMember
5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= nath_DistributorOfProductToCompanyownedRestaurantsMember
7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_CostOfGoodsProductLineMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= nath_DistributorOfProductToCompanyownedRestaurantsMember