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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Reserve for warranty, beginning of period $ 13,885 $ 14,197 $ 14,475 $ 13,796
Provision for warranty 3,143 3,204 8,874 9,384
Utilization of reserve (3,073) (3,027) (9,394) (8,806)
Reserve for warranty, end of period $ 13,955 $ 14,374 $ 13,955 $ 14,374