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Joint Venture (Unamortized Deferred Revenue from JV) (Details) - Woodward and General Electric Joint Venture [Member] - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Schedule Of Equity Method Investments [Line Items]    
Accrued liabilities $ 4,066 $ 8,317
Other liabilities $ 234,240 $ 230,588