Note A - Basis of Presentation (Details Textual)	3 Months Ended
Jun. 26, 2022
Virtual Kitchens [Member]
Cost of Product, Increase, Percent	21.00%

Amount of increase of cost of product as a percentage.

No definition available.

Name:	nath_CostOfProductIncreasePercent
Namespace Prefix:	nath_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration