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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Reserve for warranty, beginning of period $ 4,138 $ 1,856
Provision for warranty 607 386
Warranty costs paid (643) (625)
Reserve for warranty, end of period $ 4,102 $ 1,617