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INDEBTEDNESS (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 24, 2016
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Line of Credit Facility [Line Items]        
Debt outstanding   $ 0 $ 0  
Weighted average borrowing rate for short-term debt       1.70%
Financial Standby Letter of Credit        
Line of Credit Facility [Line Items]        
Letters of credit outstanding   $ 279,000 $ 279,000  
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Weighted average borrowing rate for short-term debt   3.30% 2.50%  
Revolving Credit Facility | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Margin range   1.00%    
Revolving Credit Facility | LIBOR | Maximum        
Line of Credit Facility [Line Items]        
Margin range   1.75%    
Revolving Credit Facility | Revolvers Borrowing Capacity Standard        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 75,000,000    
Accordion feature   50,000,000    
Unsecured Line Of Credit        
Line of Credit Facility [Line Items]        
Long-term line of credit borrowings   $ 0 $ 0  
Term Loans        
Line of Credit Facility [Line Items]        
Repayment of term loans $ 7,068,000      
Pre-payment penalty percent   3.00%    
Interest rate in effect   5.50%