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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 |  |  |  |  | $ 1,340,000 us-gaap_LossFromCatastrophes |  |  |
Proceeds from Insurance Settlement, Investing Activities |  |  |  | 3,400,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities |  |  |  |
Insured Event, Gain (Loss) |  | 0 us-gaap_InsuredEventGainLoss | 0 us-gaap_InsuredEventGainLoss | 2,801,000 us-gaap_InsuredEventGainLoss |  | 0 us-gaap_InsuredEventGainLoss | 2,801,000 us-gaap_InsuredEventGainLoss |
Proceeds from Insurance Settlement, Operating Activities | 718,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities |  |  |  |  | 718,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities | 0 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities |
Closed for Varying Periods of Time [Member] |  |  |  |  |  |  |  |
Extraordinary and Unusual Items [Abstract] |  |  |  |  |  |  |  |
Number of Restaurants |  |  |  |  |  |  |  | 78 us-gaap_NumberOfRestaurants / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = nath_ClosedForVaryingPeriodsOfTimeMember
Unsalable Inventories [Member] |  |  |  |  |  |  |  |
Extraordinary and Unusual Items [Abstract] |  |  |  |  |  |  |  |
Loss from Catastrophes |  |  |  |  | 42,000 us-gaap_LossFromCatastrophes / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = nath_UnsalableInventoriesMember |  |  |
Write Off of Property and Equipment [Member] |  |  |  |  |  |  |  |
Extraordinary and Unusual Items [Abstract] |  |  |  |  |  |  |  |
Loss from Catastrophes |  |  |  |  | $ 449,000 us-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 |  |  |  |  |  |  |  | 18 us-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 |  |  |  |  |  |  |  | 1 us-gaap_NumberOfRestaurants / nath_FranchisedRestaurantsAxis = nath_BrandedMenuLocationMember / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = nath_RemainClosedMember

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- Definition The excess or deficiency of insurance recoveries compared to the recorded loss incurred from an insured event (including a conversion of nonmonetary assets to monetary assets). An excess would occur from recovery of lost profits, and recoveries at current replacement cost less carrying amounts of assets that were damaged or destroyed. This element is (1) intended to be used whenever a relevant insurance event concept is needed and (2) moved to the portion of the income statement to correspond to the entity's classification as a component of operating results, nonoperating item, discontinued operations, or extraordinary item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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- Definition The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Represents the number of restaurants. + References No definition available. + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3337-108585 + Details
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