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Joint Venture (Narrative) (Details) - Woodward and General Electric Joint Venture [Member] - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items] |  |  |
Agreement to Form Joint Venture, Execution Date | Jan. 04, 2016 |  |
Other Liabilities [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Contract liabilities | $ 70,697 |  | $ 70,618
Other Assets [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Costs to fulfill a contract | 70,697 |  | $ 70,618
Sales [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Amortization of deferred income recognized as an increase to sales | 1,182 | $ 1,708 |
Reduction to sales related to royalties owed to joint venture | $ 4,420 | $ 7,234 |

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