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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 203,391 $ 155,282
Shack Sales [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 196,791 150,668
Sales-Based Royalties [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 6,400 4,425
Initial territory and opening fees    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 200 $ 189