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Product Warranty Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Standard Product Warranty Accrual [Roll Forward]      
Beginning balance $ 1,172 $ 987 $ 1,033
Warranties issued 305 759 679
Settlements made (465) (574) (725)
Ending balance $ 1,012 $ 1,172 $ 987