Accrued Liabilities (Changes in Accrued Product Warranties) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accrued Liabilities Current [Abstract]
Warranties, beginning of period	$ 18,576	$ 21,770	$ 18,972	$ 27,309
Expense, net of recoveries	(798)	2,407	214	6,189
Reductions for settlement of previous warranty liabilities	(477)	(2,874)	(1,928)	(12,328)
Foreign currency exchange rate changes	113	77	156	210
Warranties, end of period	$ 17,414	$ 21,380	$ 17,414	$ 21,380