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Business Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 24, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of business segments | segment |  |  | 3 |  |  |
Net revenues | $ 33,342 | $ 40,016 | $ 77,899 | $ 76,685 |  |
Operating income (Loss) | (602) | (1,234) | (8,137) | (7,962) |  |
Identifiable assets | 126,159 |  | $ 126,159 |  | $ 125,456 |
Product Concentration Risk | Sales Revenue, Product Line | Semiconductor |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Concentration risk, percentage (less than) |  |  | 25.00% |  |  |
SoLayTec, B.V. |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 51.00%
Operating Segments | Solar |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues | 19,001 | 24,392 | $ 38,346 | 42,141 |  |
Operating income (Loss) | (402) | 1,232 | (4,532) | (1,987) |  |
Identifiable assets | 50,580 |  | 50,580 |  | 45,717 |
Operating Segments | Semiconductor |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues | 12,200 | 12,945 | 33,406 | 25,765 |  |
Operating income (Loss) | 1,056 | (1,113) | 777 | (483) |  |
Identifiable assets | 47,874 |  | 47,874 |  | 46,912 |
Operating Segments | Polishing |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net revenues | 2,141 | 2,679 | 6,147 | 8,779 |  |
Operating income (Loss) | 343 | 574 | 899 | 1,917 |  |
Identifiable assets | 5,274 |  | 5,274 |  | 5,793 |
Non-Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income (Loss) | (1,599) | $ (1,927) | (5,281) | $ (7,409) |  |
Identifiable assets | $ 22,431 |  | $ 22,431 |  | $ 27,034 |

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