Name:	nath_DebtInstrumentCovenantDebtIssuance
Namespace Prefix:	nath_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The monetary value of the disposition of cerrtain assets individually in relation to the covenant to voluntarily pay off debt.

No definition available.

Name:	nath_DebtInstrumentCovenantDispositionOfCertainAssetsIndividuallyAmount
Namespace Prefix:	nath_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the percentage of net cash proceeds from the disposition of certain assets individually for the covenant terms for voluntary payment of the loan

No definition available.

Name:	nath_DebtInstrumentCovenantDispositionOfCertainIndividualAssetsPercentage
Namespace Prefix:	nath_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of equity issuance during the period.

No definition available.

Name:	nath_DebtInstrumentCovenantEquityIssuance
Namespace Prefix:	nath_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of extraordinary receipts the company must reinvest for the debt covenant to voluntarily pay the debt note.

No definition available.

Name:	nath_DebtInstrumentCovenantExtraordinaryReceiptPercentage
Namespace Prefix:	nath_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The monetary value of extraordinary receipts related to the debt covenant to voluntarily pay the debt note.

No definition available.

Name:	nath_DebtInstrumentCovenantExtraordinaryReceiptsAmount
Namespace Prefix:	nath_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The maximum consolidated net leverage ratio required under the covenant of the debt instrument.

No definition available.

Name:	nath_DebtInstrumentCovenantMaximumConsolidatedNetLeverageRatio
Namespace Prefix:	nath_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

The maximum fixed charge ratio required under the covenant of the debt instrument.

No definition available.

Name:	nath_DebtInstrumentCovenantMaximumFixedChargeRatio
Namespace Prefix:	nath_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

The percent of periodic payments for the debt note.

No definition available.

Name:	nath_DebtInstrumentPeriodicPaymentPercent
Namespace Prefix:	nath_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The additional increase amount of the revolving credit loan.

No definition available.

Name:	nath_LineOfCreditFacilityIncrementalBorrowingIncreaseAmount
Namespace Prefix:	nath_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The voluntary cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

No definition available.

Name:	nath_VoluntaryRepaymentsOfLongTermDebt
Namespace Prefix:	nath_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Face (par) amount of debt instrument at time of issuance.

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Period Type:	instant

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
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Balance Type:	na
Period Type:	instant

Amount of the required periodic payments applied to principal.

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Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
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Balance Type:	credit
Period Type:	duration

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Name:	us-gaap_LineOfCredit
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Balance Type:	credit
Period Type:	instant

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

No definition available.

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_DebtInstrumentAxis=nath_SeniorSecured2025NotesMember
Namespace Prefix:
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
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Name:	us-gaap_LineOfCreditFacilityAxis=nath_CitiBankNAMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_DebtInstrumentAxis=nath_TermLoanMember
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