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Supplementary Balance Sheet Information - Product Warranty and Retrofit Activity on Gross Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]      
Beginning Balance $ 2,330 $ 2,211 $ 2,314
Adjustments for acquisitions 254    
Accruals for warranties 2,438 2,300 2,779
Costs incurred (2,132) (2,181) (2,882)
Ending Balance $ 2,890 $ 2,330 $ 2,211