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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 25, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 155,282	$ 143,170
Shack Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	150,668	138,048
Sales-Based Royalties [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4,425	4,944
Initial territory and opening fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 189	$ 178

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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-Publisher FASB
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