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Goodwill (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2019 | Jun. 30, 2019 | Jun. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 257,447
Impairment |  |  |  | 0 |
Assumed annual compound growth rate after ten years | 3.39% |  |  |  |
Percent premium from goodwill analysis on renewable power system | 20.00% |  |  |  |
Aerospace [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  |  |  |
Industrial [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 257,447
Minimum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Weighted average cost of capital assumption | 9.35% |  |  |  |
Maximum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Weighted average cost of capital assumption | 17.41% |  |  |  |
Business Acquisition, Acquiree - L'Orange [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 257,447 |  |  |
Business Acquisition, Acquiree - L'Orange [Member] | Industrial [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 257,447 |  |

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- Definition Annual compound growth rate after 5 years assumption used to calculate the terminal value of the forecasted cash flows for the annual goodwill impairment test. + References No definition available. + Details
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