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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 173,385 $ 116,560  
Less: accumulated depreciation (37,121) (23,519)  
Property and equipment, net 136,264 93,041  
Depreciation 14,502 10,222 $ 5,809
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 120,629 82,904  
Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 23,194 16,903  
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 7,342 4,965  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 8,710 5,197  
Construction in progress (includes assets under construction from deemed landlord financing)      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 13,510 $ 6,591