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Joint Ventures (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jan. 04, 2016	Sep. 30, 2015
Cash received from formation of joint venture				$ 250,000	$ 0
Current portion of deferred income recorded in connection with joint venture		$ 6,109		6,109			$ 0
Noncurrent portion of deferred income recorded in connection with joint venture		241,929		241,929			0
Income taxes payable		78,430		78,430			$ 6,555
Equity interest in earnings of joint venture		$ 2,158	$ 0	$ 2,158	$ 0
Woodward and General Electric Joint Venture [Member]
Equity Method Investment, Ownership Percentage		50.00%		50.00%
Cash received from formation of joint venture		$ 250,000
Cash to be received annually from formation of joint venture	$ 4,894
Amount of deferred income recorded in connection with joint venture						$ 250,000
Current portion of deferred income recorded in connection with joint venture		6,109		$ 6,109
Noncurrent portion of deferred income recorded in connection with joint venture		241,929		241,929
Income taxes payable		94,125		94,125
Deferred income tax assets		94,125		94,125
Equity interest in earnings of joint venture		2,158
Cash distributions from joint venture		0
Net investment in joint venture		2,158		2,158
Accounts receivable from related party		4,902		4,902
Accounts payable to related party		3,288		$ 3,288
Woodward and General Electric Joint Venture [Member] | Sales [Member]
Amortization of deferred income recognized as an increase to sales		1,962
Sales to related party		15,015
Reduction to sales related to royalties paid to joint venture		$ 7,016

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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