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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Reserve for warranty, beginning of period $ 6,378 $ 1,871 $ 4,138 $ 1,856
Provision for warranty 3,515 2,882 7,142 4,240
Warranty costs paid (657) (649) (2,044) (1,992)
Reserve for warranty, end of period $ 9,236 $ 4,104 $ 9,236 $ 4,104