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Joint Ventures (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Jan. 04, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash received from formation of joint venture |  |  | $ 0 | $ 250,000 | $ 0 |
Current portion of deferred income recorded in connection with joint venture |  |  | 6,451 | 6,552 |  |
Noncurrent portion of deferred income recorded in connection with joint venture |  |  | 236,896 | 238,187 |  |
Deferred income tax assets |  |  | 201,970 | 206,966 |  |
Equity interest in earnings (losses) of joint venture |  |  | $ 2,568 | $ 6,204 | $ 0 |
Woodward and General Electric Joint Venture [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Agreement to Form Joint Venture, Execution Date |  |  |  | Jan. 04, 2016 |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |
Cash received from formation of joint venture |  | $ 250,000 |  |  |  |
Cash 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 |  |  | $ 6,451 | $ 6,552 |  |
Noncurrent portion of deferred income recorded in connection with joint venture |  |  | 236,896 | 238,187 |  |
Equity interest in earnings (losses) of joint venture |  |  | 2,568 | 6,204 |  |
Cash distributions from joint venture |  |  | 2,500 | 0 |  |
Net investment in joint venture |  |  | 6,272 | 6,204 |  |
Accounts receivable from related party |  |  | 8,554 | 5,326 |  |
Accounts payable to related party |  |  | 6,741 | 3,926 |  |
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 |  |  | 6,286 | 5,261 |  |
Sales to related party |  |  | 70,234 | 46,973 |  |
Reduction to sales related to royalties paid to joint venture |  |  | 26,133 | $ 21,391 |  |
Woodward and General Electric Joint Venture [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash received annually from formation of joint venture |  |  | $ 4,894 |  |  |

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