Supplementary Balance Sheet Information - Product Warranty and Retrofit Activity on Gross Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 2,890	$ 2,330	$ 2,211
Adjustments for acquisitions and divestitures	2,475	254
Accruals for warranties during the year	8,198	2,438	2,300
Costs incurred during the year	(3,340)	(2,132)	(2,181)
Balance at end of period	$ 10,223	$ 2,890	$ 2,330