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Product Warranty Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Standard Product Warranty Accrual [Roll Forward]      
Beginning balance $ 942 $ 1,012 $ 1,172
Warranties issued 244 666 305
Settlements made (479) (736) (465)
Ending balance $ 707 $ 942 $ 1,012