XML 61 R51.htm IDEA: XBRL DOCUMENT v2.4.1.9

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	37,661us-gaap_TreasuryStockSharesAcquired	4,647,687us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Value, Acquired, Cost Method	$ 1,916,000us-gaap_TreasuryStockValueAcquiredCostMethod	$ 56,800,000us-gaap_TreasuryStockValueAcquiredCostMethod
Common Stock, Par or Stated Value Per Share	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Stock Repurchase Program, Authorized Amount			$ 6,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	251,272us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	251,272us-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					$ 100nath_NewRightPurchasePrice
Common Stock, Capital Shares Reserved for Future Issuance	6,515,345us-gaap_CommonStockCapitalSharesReservedForFutureIssuance	6,515,345us-gaap_CommonStockCapitalSharesReservedForFutureIssuance			10,188,600us-gaap_CommonStockCapitalSharesReservedForFutureIssuance

X

- 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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X

- Definition

New right purchase price.

+ References

No definition available.

+ Details

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X

- 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

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X

- Definition

Face amount or stated value per share of common stock.

+ References

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-Topic 210

-SubTopic 10

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-Publisher SEC

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-Section 02

-Paragraph 30

-Article 5

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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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X

- 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)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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