Note C - New Accounting Pronouncements Not yet Adopted (Details Textual)	12 Months Ended
Mar. 26, 2017 USD ($)
Advertising Fund Contributions From Franchises and Other Third Parties	$ 2,572,000

The contributions to the advertising fund received from franchises and other third parties during the period.

No definition available.

Name:	nath_AdvertisingFundContributionsFromFranchisesAndOtherThirdParties
Namespace Prefix:	nath_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration