XML 81 R70.htm IDEA: XBRL DOCUMENT v3.8.0.1
COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Reserve for warranty, beginning of period $ 13,692 $ 12,832 $ 13,796 $ 12,544
Provision for warranty 3,220 3,127 6,180 5,728
Utilization of reserve (2,715) (2,670) (5,779) (4,983)
Reserve for warranty, end of period $ 14,197 $ 13,289 $ 14,197 $ 13,289