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REVENUE Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 26, 2018
Dec. 27, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Gift card liability $ 1,796 $ 1,472
Deferred revenue, current 307 265
Deferred revenue, long-term 10,026 3,742
Shack sales    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, asset, net 2,550 2,184
Licensing receivables    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, asset, net $ 2,616 $ 1,522