Note Q - Leases (Details Textual) - USD ($) $ in Thousands		9 Months Ended
Nov. 04, 2025	Dec. 28, 2025	Mar. 30, 2025
Operating Lease, Settlement Income	$ 84,000
Operating Lease Payments, Net Sublease Income		$ 1,302
Operating Lease, Liability, Current		1,937	$ 1,923
Operating Lease, Liability, Noncurrent		$ 2,320	$ 3,528

The amount of cash outflow for operating leases, net cash inflow for sublease income.

No definition available.

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

- Definition

Amount of settlement income resulting from the termination of an operating lease.

+ References

No definition available.

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

+ Details

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