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