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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Narrative) (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2017
USD ($)
Oct. 01, 2016
USD ($)
Dec. 01, 2013
USD ($)
ft²
Other Commitments [Line Items]      
Area of Land | ft²     198,000
Percentage Of Building Area Agreed To Lease From Landlord     70.00%
Period Of Warranty For Manufacturing Defects 1 year    
Lease Expiration Year 2018    
Financing obligation $ 16,074 $ 16,701 $ 20,000
Building [Member]      
Other Commitments [Line Items]      
Property, Plant and Equipment, Useful Life 25 years    
Current and Noncurrent Portion [Member]      
Other Commitments [Line Items]      
Financing obligation $ 16,800