XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.22.2.2

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

X
- Definition Amount of increase of cost of product as a percentage. + References No definition available. + Details
Name: | nath_CostOfProductIncreasePercent
Namespace Prefix: | nath_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FranchisorDisclosureAxis=nath_VirtualKitchensMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |