Name:	nath_DividendsPayableNoncurrent
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income after one year or beyond the normal operating cycle, if longer and noncurrent obligations not separately disclosed in the balance sheet (other liabilities, noncurrent).

No definition available.

Name:	us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date.

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 210.5-02.26(c))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707

Name:	us-gaap_DeferredRentCreditNoncurrent
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount recognized for uncertainty in income taxes classified as noncurrent.

Name:	us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations and noncurrent portion of deferred revenue not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months.

No definition available.

Name:	us-gaap_OtherLiabilitiesAndDeferredRevenueNoncurrent
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Data Type:	xbrli:monetaryItemType
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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.