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Joint Venture (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 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	$ 3,006	$ 1,006	$ 4,471	$ 1,602
Costs recognized to fulfill a contract	99,984		99,984
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	4,170		8,598
Additional costs to fulfill a contract	$ 4,170		$ 8,598
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	6,897		6,897			$ 7,087
Noncurrent portion of deferred income recorded in connection with joint venture	235,961		235,961			235,300
Equity interest in earnings (losses) of joint venture	3,006	1,006	4,471	1,602
Cash distributions from joint venture	3,000	0	7,500	0
Net investment in joint venture	6,582		6,582			9,611
Accounts receivable from related party	6,803		6,803			10,499
Accounts payable to related party	3,591		3,591			$ 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	1,922	1,486	3,699	2,539
Sales to related party	14,294	17,077	27,127	30,052
Reduction to sales related to royalties paid to joint venture	$ 9,069	$ 6,922	$ 18,251	$ 12,330

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