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Accrued Liabilities (Changes in Accrued Product Warranties) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities    
Warranties, beginning of period $ 20,130 $ 13,597
Impact from adoption of ASC 606 (Note 3) 594
Expense, net of recoveries 2,072 (2,030)
Reductions for settlement of previous warranty liabilities (2,537) 1,377
Foreign currency exchange rate changes (103) 73
Warranties, end of period $ 20,156 $ 13,017