Joint Venture (Other Income Related JV) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Other income	$ 3,779	$ 4,681	$ 6,165	$ 7,893
Woodward and General Electric Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Other income	$ 3,779	$ 4,681	$ 6,165	$ 7,893

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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