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Product Warranty Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Product Warranties Disclosures [Abstract]        
Warranty period, minimum     1 year  
Warranty period, maximum     5 years  
Standard Product Warranty Accrual [Roll Forward]        
Beginning balance $ 1,025 $ 968 $ 1,033 $ 1,014
Warranties issued 62 172 231 292
Settlements made (195) (196) (372) (362)
Ending balance $ 892 $ 944 $ 892 $ 944