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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Sep. 27, 2023	Jun. 28, 2023	Mar. 29, 2023	Sep. 28, 2022	Jun. 29, 2022	Mar. 30, 2022	Dec. 27, 2023	Dec. 28, 2022	Dec. 29, 2021
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 276,207	$ 271,805	$ 253,278	$ 227,814	$ 230,752	$ 203,391	$ 1,087,533	$ 900,486	$ 739,893
Shack sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 264,980	$ 261,810	$ 244,254	$ 219,501	$ 223,054	$ 196,791	1,046,819	869,270	714,989
Sales-based royalties
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax							39,853	30,204	24,150
Initial territory and opening fees
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax							$ 861	$ 1,012	$ 754

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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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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.

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