Note G - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Mar. 29, 2020	Mar. 31, 2019
Property Depreciation and Amortization	$ 1,149	$ 1,212

The amount of depreciation and amortization associated with property.

No definition available.

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