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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Reserve for warranty, beginning of period $ 4,102 $ 1,617 $ 4,138 $ 1,856
Provision for warranty 3,020 972 3,627 1,358
Warranty costs paid (744) (718) (1,387) (1,343)
Reserve for warranty, end of period $ 6,378 $ 1,871 $ 6,378 $ 1,871