Note A - Basis of Presentation (Details Textual)	6 Months Ended
Sep. 26, 2021
Virtual Kitchens [Member]
Cost of Product, Increase, Percent	8.00%

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