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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]      
Reserve for warranty, beginning of period $ 13,796 $ 12,544 $ 10,632
Provision for warranty 12,603 11,743 11,553
Utilization of reserve (11,925) (10,491) (9,641)
Reserve for warranty, end of period $ 14,474 $ 13,796 $ 12,544