Joint Venture (Net Sales to the JV) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Woodward and General Electric Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Net sales	[1]	$ 8,325	$ 16,606	$ 18,384	$ 31,484

[1] Net sales included a reduction of $6,635 for the three-months and $11,055 for the six-months ended March 31, 2021 related to royalties owed to the JV by Woodward on sales by Woodward directly to third party aftermarket customers, compared to a reduction to sales of $9,779 for the three-months and $17,013 for the six-months ended March 31, 2020.