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Accrued Liabilities (Changes in Accrued Product Warranties) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accrued Liabilities        
Warranties, beginning of period $ 21,790 $ 13,283 $ 20,130 $ 13,597
Increases due to acquisition of L'Orange   6,045   6,045
Impact from adoption of ASC 606 (Note 3) 704
Expense, net of recoveries 4,268 2,696 10,035 3,000
Reductions for settlement of previous warranty liabilities (3,315) (1,838) (7,864) (2,670)
Foreign currency exchange rate changes 105 (384) (157) (170)
Warranties, end of period $ 22,848 $ 19,802 $ 22,848 $ 19,802