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Joint Venture (Accounts Receivable, Accounts Payable, and Other Assets Related to JV) (Details) - Woodward and General Electric Joint Venture [Member] - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Schedule Of Equity Method Investments [Line Items] |  |
Accounts receivable | $ 3,062 | $ 5,906
Accounts payable | 1,502 | 4,270
Other assets | $ 9,123 | $ 7,543

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