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INDEBTEDNESS (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Nov. 15, 2017
Line of Credit Facility [Line Items]        
Debt outstanding $ 0 $ 0    
Financial Standby Letter of Credit        
Line of Credit Facility [Line Items]        
Letters of credit outstanding $ 181,000 $ 181,000    
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Interest rate in effect 1.10% 3.00%    
Weighted average borrowing rate for short-term debt 1.10% 3.00% 3.30%  
Revolving Credit Facility | Minimum | LIBOR        
Line of Credit Facility [Line Items]        
Margin range 1.00%      
Revolving Credit Facility | Maximum | LIBOR        
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
Aggregate borrowing amount       $ 125,000
Unsecured Line Of Credit        
Line of Credit Facility [Line Items]        
Long-term line of credit borrowings $ 0 $ 0