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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Commitments and Contingencies Disclosure [Abstract]      
Standard Product Warranty Accrual, Additions from Business Acquisition $ 0 $ 0 $ 547
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]      
Reserve for product warranty, beginning of period 4,138 1,856 1,542
Provision for product warranty 10,404 4,816 2,614
Product warranty costs paid (2,709) (2,534) (2,847)
Reserve for product warranty, end of period $ 11,833 $ 4,138 $ 1,856