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REVENUE - Schedule of Respective Liability Balances (Details) - USD ($)
$ in Thousands
Jun. 26, 2024
Dec. 27, 2023
Disaggregation of Revenue [Line Items]    
Gift card liability $ 2,047 $ 2,603
Deferred revenue, current 1,328 1,192
Deferred revenue, long-term 16,777 17,157
Shack sales    
Disaggregation of Revenue [Line Items]    
Contract with customer, asset, net 9,399 9,884
Licensing receivables, net of allowance for doubtful accounts    
Disaggregation of Revenue [Line Items]    
Contract with customer, asset, net $ 5,440 $ 4,610