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Product Warranty Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Standard Product Warranty Accrual [Roll Forward]      
Beginning balance $ 1,014 $ 862 $ 1,063
Warranties issued 771 967 627
Settlements made (752) (815) (828)
Ending balance $ 1,033 $ 1,014 $ 862