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Note B - Summary of Significant Accounting Policies - Summary of Franchise Openings and Closings for the Nathan's Franchise Restaurant System (Details) - Franchised Units [Member] | 12 Months Ended
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Mar. 29, 2020 | Mar. 31, 2019
Franchised restaurants operating at the beginning of the period | 255 | 276
New franchised restaurants opened during the period | 16 | 13
Franchised restaurants closed during the period | (55) | (34)
Franchised restaurants operating at the end of the period | 216 | 255

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- Definition The number of restaurants closed during the period. + References No definition available. + Details
Name: | nath_NumberOfRestaurantsClosed
Namespace Prefix: | nath_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of new restaurants opened during the period. + References No definition available. + Details
Name: | nath_NumberOfRestaurantsOpen
Namespace Prefix: | nath_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of restaurants. + References No definition available. + Details
Name: | us-gaap_NumberOfRestaurants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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