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Joint Venture (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Oct. 01, 2018	Sep. 30, 2018	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity interest in earnings (losses) of joint venture	$ 3,290		$ 738		$ 7,761	$ 2,340
Costs recognized to fulfill a contract	97,789				97,789
ASC 606 [Member]
Schedule of Equity Method Investments [Line Items]
Revenue recognized to contract liabilities							$ 57,529
Costs recognized to fulfill a contract							$ 57,529
Additional contract liabilities	3,042				11,640
Reduction in contract liabilities and costs to fulfill contract	2,774				2,774
Additional costs to fulfill a contract	$ 3,042				$ 11,640
Woodward and General Electric Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Agreement to Form Joint Venture, Execution Date					Jan. 04, 2016
Ownership interest, joint venture	50.00%				50.00%				50.00%
Cash received from formation of joint venture					$ 250,000
Cash received annually from formation of joint venture		$ 4,894		$ 4,894	4,894
Current portion of deferred income recorded in connection with joint venture	$ 6,806				6,806			$ 7,087
Noncurrent portion of deferred income recorded in connection with joint venture	234,038				234,038			235,300
Equity interest in earnings (losses) of joint venture	3,290		738		7,761	2,340
Cash distributions from joint venture	4,500		0		12,000	0
Net investment in joint venture	5,373				5,373			9,611
Accounts receivable from related party	5,441				5,441			10,499
Accounts payable to related party	2,365				2,365			$ 2,944
Woodward and General Electric Joint Venture [Member] | Sales [Member]
Schedule of Equity Method Investments [Line Items]
Amortization of deferred income recognized as an increase to sales	2,013		1,564		5,712	4,103
Sales to related party	18,049		20,085		45,176	50,137
Reduction to sales related to royalties paid to joint venture	$ 6,897		$ 7,340		$ 25,148	$ 19,670

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