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Joint Ventures (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Jan. 04, 2016
Cash received from formation of joint venture				$ 250,000	$ 0	$ 0
Current portion of deferred income recorded in connection with joint venture			$ 6,552	6,552	0
Noncurrent portion of deferred income recorded in connection with joint venture			238,187	238,187
Income taxes payable			4,547	4,547	6,555
Deferred income tax assets			$ 206,966	206,966	94,203
Equity interest in earnings of joint venture				$ 6,204	$ 0	$ 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			$ 6,552	$ 6,552
Noncurrent portion of deferred income recorded in connection with joint venture			238,187	238,187
Deferred income tax assets		$ 94,125
Equity interest in earnings of joint venture			6,204
Cash distributions from joint venture			0
Net investment in joint venture			6,204	6,204
Accounts receivable from related party			5,326	5,326
Accounts payable to related party			3,926	$ 3,926
Woodward and General Electric Joint Venture [Member] | Sales [Member]
Amortization of deferred income recognized as an increase to sales			5,261
Sales to related party			46,973
Reduction to sales related to royalties paid to joint venture			$ 21,391

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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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