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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 25, 2024	Dec. 27, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,445,306	$ 1,252,608	$ 1,087,533
Shack sales
Disaggregation of Revenue [Line Items]
Total revenue	1,391,166	1,207,561	1,046,819
Sales-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	51,532	43,487	39,853
Initial territory, opening, and termination fees
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,608	$ 1,560	$ 861

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- Definition

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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