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Acquisitions (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Jan. 30, 2015 shares | Dec. 24, 2014 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Net charge |  |  |  | $ 0 | $ 0 | $ 583
Employee Severance |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net charge |  |  |  |  |  | $ 600
BTU International, Inc (BTU) Merger |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Exchange ratio |  | 0.3291 |  |  |  |
SoLayTec, B.V. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 51.00% |  |  |
Purchase price |  |  | $ 1,900 |  |  |
Noncontrolling interest | $ 2,700 |  |  |  |  |
Merger Agreement | BTU International, Inc (BTU) Merger |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  | 100.00% |  |  |  |
The Company | Merger Agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Exchange ratio |  | 0.3291 |  |  |  |
BTU International, Inc (BTU) Merger | Merger Agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of stock, shares issued | shares |  | 3,185,852 |  |  |  |
Agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Extinguishment of debt | $ 2,400 |  |  |  |  |

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