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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Reserve for warranty, beginning of period $ 16,961 $ 9,576
Provision for warranty 3,968 5,300
Utilization of reserve (3,819) (2,740)
Reserve for warranty, end of period $ 17,110 $ 12,136