Contingencies - Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Standard product warranty length, minimum			1 year
Standard product warranty length, maximum			2 years
Limited product warranty length (up to)			10 years
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 12,743	$ 12,616	$ 12,931	$ 13,052
Accruals for warranties issued	2,811	2,783	5,183	5,037
Net changes in liability related to warranties existing in prior periods	(512)	(57)	22	320
Payments made	(2,361)	(2,921)	(5,455)	(5,988)
Balance at end of period	$ 12,681	$ 12,421	$ 12,681	$ 12,421