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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Other Intangible Assets) (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 01, 2016
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Impairment losses   $ 0 $ 0 $ 0
Amortization of patents and other intangible assets   1,111,000 $ 1,276,000 $ 1,179,000
Expected amortization in 2018   1,073,000    
Expected amortization in 2019   1,007,000    
Expected amortization in 2020   817,000    
Expected amortization in 2021   688,000    
Expected amortization in 2022   $ 688,000    
Diving        
Impairment of long-lived assets $ 0      
Minimum        
Useful life (years)   4 years    
Maximum        
Useful life (years)   15 years