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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