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CREDIT FACILITIES - Narrative (Details) - USD ($)
3 Months Ended
Jan. 01, 2021
Dec. 27, 2019
Sep. 30, 2020
Line of Credit Facility [Line Items]      
Advances from revolving credit facility $ 34,122,000 $ 15,809,000  
Repayments of long-term debt 32,166,000   $ 21,476,000
Master Lease [Member]      
Line of Credit Facility [Line Items]      
Long-term line of credit 2,500,000   1,800,000
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Repayments of long-term debt $ 29,862,000   19,960,000
Maximum borrowing capacity as percentage of eligible receivables 85.00%    
Maximum borrowing capacity based on eligible inventories $ 30,000,000.0    
Current borrowing capacity 40,500,000   39,400,000
Available capacity on credit facility 10,600,000   $ 19,400,000
Average Revolver balances $ 29,800,000 $ 24,500,000  
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 $ 45,000,000.0    
Basis spread on variable rate 1.75%    
Line of Credit Facility, Covenant, Minimum Fixed Charge Coverage Ratio 1.10