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REVENUE Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2020
Sep. 23, 2020
Jun. 24, 2020
Mar. 25, 2020
Dec. 25, 2019
Sep. 25, 2019
Jun. 26, 2019
Mar. 27, 2019
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE $ 157,510 $ 130,401 $ 91,786 $ 143,170 $ 151,435 $ 157,762 $ 152,713 $ 132,609 $ 522,867 $ 594,519 $ 459,310
Shack sales                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 506,339 574,625 445,589
Sales-based royalties                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 15,773 19,318 13,422
Initial territory and opening fees                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 $ 755 $ 576 $ 299