XML 47 R36.htm IDEA: XBRL DOCUMENT v3.20.4

Note A - Basis of Presentation (Details Textual)	Dec. 27, 2020
COVID 19 [Member]
Percentage of Franchises Open	60.00%

X

- Definition

The percentage of franchises open.

+ References

No definition available.

+ Details

Name:	nath_PercentageOfFranchisesOpen
Namespace Prefix:	nath_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=nath_Covid19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: