Joint Venture (Accounts Receivable, Accounts Payable, and Other Assets Related to JV) (Details) - Woodward and General Electric Joint Venture [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items]
Accounts receivable	$ 2,892	$ 3,062
Accounts payable	1,478	1,502
Other assets	$ 8,009	$ 9,123