Supplementary Balance Sheet Information - Product Warranty and Retrofit Cost (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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	645	1,529
Costs incurred during the year	(1,123)	(1,342)
Balance at end of period	$ 9,745	$ 5,380