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REVENUE - Schedule of Respective Liability Balances (Details) - USD ($)
$ in Thousands
Dec. 27, 2023
Dec. 28, 2022
Disaggregation of Revenue [Line Items]    
Gift card liability $ 2,603 $ 2,285
Deferred revenue, current 1,192 969
Contract with Customer, Liability, Noncurrent 17,157 14,340
Shack sales    
Disaggregation of Revenue [Line Items]    
Contract with customer, asset, net 9,884 8,779
Licensing receivables, net of allowance for doubtful accounts    
Disaggregation of Revenue [Line Items]    
Contract with customer, asset, net $ 4,610 $ 3,918