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NATURE OF OPERATIONS (Details)	Mar. 31, 2021 Restaurant Shack
Class of Stock [Line Items]
Number of restaurants	321
United States | Company-operated
Class of Stock [Line Items]
Number of restaurants	192
United States | Licensed
Class of Stock [Line Items]
Number of restaurants	22
Number of Shacks closed | Shack	16
Non-United States | Licensed
Class of Stock [Line Items]
Number of restaurants	107

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COVID-19 Response, Number of Stores Temporarily Closed

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Represents the number of restaurants.

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