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WARRANTIES (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Balance at beginning of period $ 6,393 $ 4,326
Expense accruals for warranties issued during the period 7,485 5,386
Less current period warranty claims paid 4,981 3,461
Balance at end of period $ 8,897 $ 6,251