Supplementary Balance Sheet Information - Product Warranty and Retrofit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 10,223	$ 2,890
Adjustment for acquisitions		2,303
Accruals for warranties during the year	692	307
Costs incurred during the year	(868)	(321)
Balance at end of period	$ 10,047	$ 5,179