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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. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Impairment losses   $ 0 $ 0  
Amortization of patents and other intangible assets   1,276,000 $ 1,179,000 $ 856,000
Expected amortization in 2018   1,098,000    
Expected amortization in 2019   1,080,000    
Expected amortization in 2020   1,014,000    
Expected amortization in 2021   821,000    
Expected amortization in 2022   $ 689,000    
Diving        
Impairment of long-lived assets $ 0      
Minimum        
Useful life (years)   4 years    
Maximum        
Useful life (years)   15 years