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Accrued Liabilities (Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Accrued Liabilities      
Warranties, beginning of period $ 13,597 $ 15,993 $ 13,741
Warranty Expense, net of recoveries 5,158 9,135 9,902
Increases due to acquisition of L'Orange 6,045    
Reductions for settling warranties (4,413) (11,692) (7,802)
Foreign currency exchange rate changes (257) 161 152
Warranties, end of period $ 20,130 $ 13,597 $ 15,993