Joint Venture (Other Income Related JV) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule Of Equity Method Investments [Line Items]
Other income	$ 931	$ 3,290	$ 8,824	$ 7,761
Woodward and General Electric Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Other income	$ 931	$ 3,290	$ 8,824	$ 7,761

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

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