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Note M - Commitments and Contingencies (Details Textual) (USD $)
12 Months Ended 5 Months Ended 1 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Mar. 31, 2013
Apr. 30, 2014
Oct. 29, 2012
Operating Leases, Rent Expense, Net $ 1,617,000us-gaap_OperatingLeasesRentExpenseNet $ 1,391,000us-gaap_OperatingLeasesRentExpenseNet $ 1,102,000us-gaap_OperatingLeasesRentExpenseNet      
Operating Leases, Rent Expense, Sublease Rentals 267,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 265,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 353,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1      
Operating Leases, Rent Expense, Contingent Rentals 489,000us-gaap_OperatingLeasesRentExpenseContingentRentals 454,000us-gaap_OperatingLeasesRentExpenseContingentRentals 399,000us-gaap_OperatingLeasesRentExpenseContingentRentals      
Property Subject to or Available for Operating Lease, Number of Units 2us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits          
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 2,774,000us-gaap_InsuredEventGainLoss 0us-gaap_InsuredEventGainLoss      
Proceeds from Insurance Settlement, Operating Activities 718,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 0us-gaap_ProceedsFromInsuranceSettlementOperatingActivities      
Closed for Varying Periods of Time [Member] | Branded Menu Location [Member]            
Number of Restaurants           18us-gaap_NumberOfRestaurants
/ us-gaap_FranchisorDisclosureAxis
= nath_BrandedMenuLocationMember
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_ClosedForVaryingPeriodsOfTimeMember
Closed for Varying Periods of Time [Member]            
Number of Restaurants           78us-gaap_NumberOfRestaurants
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_ClosedForVaryingPeriodsOfTimeMember
Remain Closed [Member] | Branded Menu Location [Member]            
Number of Restaurants           1us-gaap_NumberOfRestaurants
/ us-gaap_FranchisorDisclosureAxis
= nath_BrandedMenuLocationMember
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_RemainClosedMember
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
   
Unsalable Inventories [Member]            
Loss from Catastrophes     42,000us-gaap_LossFromCatastrophes
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_UnsalableInventoriesMember
     
Business Interruption Claim, Net of Fees [Member]            
Proceeds from Insurance Settlement, Operating Activities         $ 718,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= nath_BusinessInterruptionClaimNetOfFeesMember
 
Minimum [Member]            
Lessee Leasing Arrangements, Operating Leases, Term of Contract 5 years          
Lessee Leasing Arrangements, Operating Leases, Renewal Term 5 years          
Maximum [Member]            
Lessee Leasing Arrangements, Operating Leases, Term of Contract 20 years          
Lessee Leasing Arrangements, Operating Leases, Renewal Term 20 years