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Contingencies - Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 13,052 $ 13,388 $ 15,331
Accruals for warranties issued 10,963 10,910 11,847
Changes in liability related to warranties existing in prior periods 864 (1,352) (1,686)
Payments made (11,948) (9,894) (12,104)
Balance at end of period $ 12,931 $ 13,052 $ 13,388