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Joint Venture (Net Sales to the JV) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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