Joint Venture (Net Sales to the JV) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Woodward and General Electric Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Net sales	[1]	$ 48,222	$ 60,955	$ 72,511

[1] Net sales include a reduction of $23,904 for the fiscal year ended September 30, 2020, $34,236 for the fiscal year ended September 30, 2019, and $26,023 for the fiscal year ended September 30, 2018 related to royalties owed to the JV by Woodward on sales by Woodward directly to third party aftermarket customers.