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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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