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Note N - Superstorm Sandy (Details Textual) (USD $)
1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended
Apr. 30, 2014
Dec. 28, 2014
Dec. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Oct. 29, 2012
Extraordinary and Unusual Items [Abstract]                
Loss from Catastrophes         $ 1,340,000us-gaap_LossFromCatastrophes      
Proceeds from Insurance Settlement, Investing Activities       3,400,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities        
Insured Event, Gain (Loss)   0us-gaap_InsuredEventGainLoss 0us-gaap_InsuredEventGainLoss 2,801,000us-gaap_InsuredEventGainLoss   0us-gaap_InsuredEventGainLoss 2,801,000us-gaap_InsuredEventGainLoss  
Proceeds from Insurance Settlement, Operating Activities 718,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities         718,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities  
Closed for Varying Periods of Time [Member]                
Extraordinary and Unusual Items [Abstract]                
Number of Restaurants               78us-gaap_NumberOfRestaurants
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_ClosedForVaryingPeriodsOfTimeMember
Unsalable Inventories [Member]                
Extraordinary and Unusual Items [Abstract]                
Loss from Catastrophes         42,000us-gaap_LossFromCatastrophes
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_UnsalableInventoriesMember
     
Write Off of Property and Equipment [Member]                
Extraordinary and Unusual Items [Abstract]                
Loss from Catastrophes         $ 449,000us-gaap_LossFromCatastrophes
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_WriteOffOfPropertyAndEquipmentMember
     
Branded Menu Location [Member] | Closed for Varying Periods of Time [Member]                
Extraordinary and Unusual Items [Abstract]                
Number of Restaurants               18us-gaap_NumberOfRestaurants
/ nath_FranchisedRestaurantsAxis
= nath_BrandedMenuLocationMember
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_ClosedForVaryingPeriodsOfTimeMember
Branded Menu Location [Member] | Remain Closed [Member]                
Extraordinary and Unusual Items [Abstract]                
Number of Restaurants               1us-gaap_NumberOfRestaurants
/ nath_FranchisedRestaurantsAxis
= nath_BrandedMenuLocationMember
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_RemainClosedMember