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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Apr. 03, 2021
Mar. 28, 2020
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Reserve for warranty, beginning of period $ 12,136 $ 14,714 $ 9,576 $ 14,185
Provision for warranty 6,029 2,923 11,329 6,418
Utilization of reserve (2,591) (3,269) (5,331) (6,235)
Reserve for warranty, end of period $ 15,574 $ 14,368 $ 15,574 $ 14,368