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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Reserve for warranty, beginning of period $ 11,833 $ 4,138
Provision for warranty 2,037 607
Warranty costs paid (639) (643)
Reserve for warranty, end of period $ 13,231 $ 4,102