Contingencies - Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 13,046	$ 13,926	$ 12,931
Warranty provision	9,483	9,672	13,093
Warranty expenditures	(9,812)	(10,552)	(12,098)
Balance at end of period	$ 12,717	$ 13,046	$ 13,926