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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2018
Dec. 27, 2017
Dec. 28, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 347,301 $ 245,350  
Less: accumulated depreciation (85,447) (58,255)  
Property and equipment, net 261,854 187,095  
Depreciation 29,000 21,704 $ 14,502
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 228,453 166,963  
Landlord funded assets      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 15,595 7,472  
Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 40,716 31,608  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 14,055 10,128  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 19,008 12,721  
Construction in progress (includes assets under construction from deemed landlord financing)      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 29,474 $ 16,458