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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2024
Jun. 28, 2023
Jun. 26, 2024
Jun. 28, 2023
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 316,496 $ 271,805 $ 607,000 $ 525,083
Shack sales        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 305,480 261,810 586,032 506,064
Sales-based royalties        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 10,624 9,712 20,257 18,490
Initial territory and opening fees        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 392 $ 283 $ 711 $ 529