Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales to external customers		$ 1,464,429	$ 1,429,456	$ 1,444,441
Transferred over Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales to external customers		$ 615,978	$ 592,755	$ 563,386
Minimum | Transferred at Point in Time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Sales to external customers	$ 100