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Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of the period $ 17,274 $ 23,309
Warranty provision for sales 2,697 4,108
Settlement of warranty claims (8,221) (9,701)
Foreign currency translation and other (445) (341)
Balance at end of the period $ 11,305 $ 17,375