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Note L - Stockholders' Equity (Details Textual) (USD $) | 9 Months Ended | 159 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 28, 2014 | Dec. 28, 2014 | Sep. 11, 2014 | Mar. 30, 2014 | Jun. 05, 2013
Stockholders' Equity Note [Abstract] |  |  |  |  |
Treasury Stock, Shares, Acquired | 37,661 us-gaap_TreasuryStockSharesAcquired | 4,647,687 us-gaap_TreasuryStockSharesAcquired |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 1,916,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 56,800,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |
Stock Repurchase Program, Authorized Amount |  |  | $ 6,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 251,272 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased | 251,272 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  |
Minimum Percentage of Common Stock Acquired by a Person or Group which Triggers Exercise of New Rights |  |  |  |  | 15.00%nath_MinimumPercentageOfCommonStockAcquiredByAPersonOrGroupWhichTriggersExerciseOfNewRights
New Right Purchase Price |  |  |  |  | $ 100 nath_NewRightPurchasePrice
Common Stock, Capital Shares Reserved for Future Issuance | 6,515,345 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance | 6,515,345 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  | 10,188,600 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance

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- Definition Minimum percentage of common stock acquired by a person or group which triggers exercise of new rights. + References No definition available. + Details
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- Definition New right purchase price. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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