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LONG-TERM DEBT AND FINANCING LEASE OBLIGATIONS - Narrative (Details)
$ in Thousands
12 Months Ended
Jun. 20, 2019
USD ($)
Dec. 30, 2018
USD ($)
property
Dec. 29, 2019
USD ($)
Long-term debt      
Weighted average interest rate   4.41% 5.00%
Outstanding balance     $ 6,924
Revolving Promissory Note      
Long-term debt      
Maximum borrowing capacity $ 1,000    
Outstanding balance $ 0    
Revolving Promissory Note | 30-day LIBOR      
Long-term debt      
Debt instrument, basis spread on variable rate 3.25%    
Minimum | Prime Rate      
Long-term debt      
Rate of interest 5.00%    
Minimum | Revolving Promissory Note      
Long-term debt      
Rate of interest 3.75%    
Financing Arrangement - Sale Leaseback      
Long-term debt      
Weighted average interest rate   8.09%  
Number of properties that can be repurchased at the end of the lease term | property   2  
Term Loan      
Long-term debt      
Maximum borrowing capacity $ 24,000    
Period of time, after the first year of the draw period, during which both principal and interest payments are due 5 years    
Debt principal amortization period 60 months    
Outstanding balance     $ 6,924
Prepayment penalty $ 0    
Real Estate Loan      
Long-term debt      
Outstanding balance $ 2,600 $ 2,705