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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