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

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.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of the required periodic payments applied to principal.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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

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://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_LineOfCreditFacilityAxis=nath_CitiBankNAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: