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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) | 12 Months Ended
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Mar. 30, 2025 | Mar. 31, 2024
Franchised restaurants operating at the beginning of the period | 230 |
New franchised restaurants opened during the period | 25 |
Franchised restaurants closed during the period | (25) |
Franchised restaurants operating at the end of the period | 230 | 230
Franchised Units [Member] |  |
Franchised restaurants operating at the beginning of the period | 230 | 232
New franchised restaurants opened during the period |  | 17
Franchised restaurants closed during the period |  | (19)
Franchised restaurants operating at the end of the period | 230 | 230

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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

X
- 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

X
- 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: |