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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 | Mar. 31, 2021 | Sep. 30, 2020
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Schedule Of Equity Method Investments [Line Items] |  |
Accounts receivable | $ 3,526 | $ 3,062
Accounts payable | 4,534 | 1,502
Other assets | $ 8,288 | $ 9,123

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