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DEBT (Details) - USD ($)
3 Months Ended
Sep. 27, 2017
Feb. 04, 2015
Mar. 28, 2018
Mar. 29, 2017
Dec. 27, 2017
Debt Instrument [Line Items]          
Deemed landlord financing     $ 17,030,000   $ 14,518,000
Interest costs incurred     609,000 $ 324,000  
Interest costs capitalized     44,000 $ 21,000  
Notes payable          
Debt Instrument [Line Items]          
Notes payable     0    
Third Amendment and Restated Credit Arrangement | Line of credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 50,000,000      
Current borrowing capacity   $ 20,000,000      
Term to maturity   5 years      
Amount available under revolving credit facility     19,317,000    
Third Amendment and Restated Credit Arrangement | Letter of credit | Line of credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 10,000,000      
Current borrowing capacity     $ 683,000    
Third Amendment and Restated Credit Arrangement | Minimum | Line of credit | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.30%        
Third Amendment and Restated Credit Arrangement | Minimum | Line of credit | Prime rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.00%        
Third Amendment and Restated Credit Arrangement | Maximum | Line of credit | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate 3.30%        
Third Amendment and Restated Credit Arrangement | Maximum | Line of credit | Prime rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.80%