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DEBT (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 04, 2015
May 31, 2016
Dec. 26, 2018
Dec. 27, 2017
Dec. 28, 2016
Mar. 31, 2013
Debt Instrument [Line Items]            
Deemed landlord financing     $ 20,846,000 $ 14,518,000    
Interest costs incurred     2,572,000 1,806,000 $ 374,000  
Interest costs capitalized     157,000 164,000 $ 0  
Notes payable            
Debt Instrument [Line Items]            
Notes payable face amount           $ 313,000
Notes payable       0    
Revolving Credit Facility | Line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 50,000,000          
Current borrowing capacity $ 20,000,000          
Term to maturity 5 years          
Short-term borrowings     0 $ 0    
Remaining borrowing capacity     19,317,000      
Revolving Credit Facility | Letter of credit | Line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 10,000,000          
Current borrowing capacity     $ 683,000      
Revolving Credit Facility | Minimum | Line of credit | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate   2.30%        
Revolving Credit Facility | Minimum | Line of credit | Prime rate            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.00%        
Revolving Credit Facility | Maximum | Line of credit | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate   3.30%        
Revolving Credit Facility | Maximum | Line of credit | Prime rate            
Debt Instrument [Line Items]            
Basis spread on variable rate   0.80%