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CREDIT FACILITIES - Narrative (Details)
1 Months Ended 3 Months Ended
May 06, 2019
USD ($)
Mar. 18, 2019
USD ($)
Sep. 27, 2018
USD ($)
Jul. 26, 2018
USD ($)
Jan. 31, 2013
USD ($)
Dec. 27, 2019
USD ($)
Dec. 28, 2018
USD ($)
Sep. 30, 2019
USD ($)
Jan. 18, 2013
USD ($)
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity           $ 35,000,000      
Advances from revolving credit facility           15,809,000 $ 20,608,000    
Repayments of long-term debt           27,803,000   $ 30,281,000  
Credit Agreement 2013 [Member] | Term Loan B [Member]                  
Line of Credit Facility [Line Items]                  
Long-term line of credit                 $ 14,000,000
Repayment monthly installments         120 equal monthly installments        
Line of credit facility, periodic payment, principal         $ 117,000 71,000      
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid           600,000      
Face amount           6,000,000     $ 8,000,000
Revolving Credit Facility [Member]                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity           $ 35,000,000      
Maturity date           May 05, 2022      
Repayments of long-term debt           $ 24,490,000   26,646,000  
Maximum borrowing capacity as percentage of eligible receivables           85.00%      
Maximum borrowing capacity based on eligible inventories           $ 14,000,000.0      
Current borrowing capacity           35,000,000.0   35,000,000  
Line of Credit Facility, Remaining Borrowing Capacity           10,500,000   $ 8,400,000  
Line of Credit Facility, Average Outstanding Amount           $ 24,500,000 15,000,000    
Revolving Credit Facility [Member] | Minimum [Member]                  
Line of Credit Facility [Line Items]                  
Unused capacity, commitment fee percentage           0.25%      
Revolving Credit Facility [Member] | Maximum [Member]                  
Line of Credit Facility [Line Items]                  
Unused capacity, commitment fee percentage           0.375%      
Revolving Credit Facility [Member] | Credit Agreement 2013 [Member]                  
Line of Credit Facility [Line Items]                  
Average borrowing capacity           $ 27,000,000      
Commitment fee amount           $ 5,800 $ 8,200    
Line of Credit Facility, Covenant, Minimum Fixed Charge Coverage Ratio           1.10      
Equipment Line Advances [Member]                  
Line of Credit Facility [Line Items]                  
Maximum borrowing capacity           $ 1,500,000      
Equipment Line Advances Term Note [Member]                  
Line of Credit Facility [Line Items]                  
Debt Conversion, Converted Instrument, Amount $ 400,000 $ 300,000 $ 100,000 $ 800,000          
Debt instrument, periodic payment, principal $ 11,000 $ 9,000 $ 2,000 $ 21,000          
Term Loan B [Member]                  
Line of Credit Facility [Line Items]                  
Maturity date           May 05, 2022