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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Reserve for warranty, beginning of period (As Restated) $ 14,197 $ 13,289 $ 13,796 $ 12,544
Provision for warranty 3,204 3,121 9,384 8,849
Utilization of reserve (3,027) (2,570) (8,806) (7,553)
Reserve for warranty, end of period $ 14,374 $ 13,840 $ 14,374 $ 13,840