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Business Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of business segments | segment |  |  | 3 |  |
Net revenues | $ 21,003 | $ 28,743 | $ 64,861 | $ 76,974 |
Operating income (loss) | 1,351 | 2,826 | 3,263 | 7,172 |
Identifiable assets | 127,426 |  | 127,426 |  | $ 149,406
Operating Segments | Semiconductor |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 16,254 | 23,472 | 51,267 | 60,945 |
Operating income (loss) | 1,951 | 3,861 | 6,428 | 9,122 |
Identifiable assets | 60,086 |  | 60,086 |  | 59,744
Operating Segments | SiC/LED |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 3,074 | 3,594 | 9,330 | 10,720 |
Operating income (loss) | 607 | 938 | 2,253 | 3,153 |
Identifiable assets | 7,635 |  | 7,635 |  | 6,545
Operating Segments | Automation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net revenues | 1,675 | 1,677 | 4,264 | 5,309 |
Operating income (loss) | (52) | (195) | (392) | (231) |
Identifiable assets | 2,753 |  | 2,753 |  | 3,586
Non-Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (1,155) | $ (1,778) | (5,026) | $ (4,872) |
Identifiable assets | 33,987 |  | 33,987 |  | 34,209
Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Identifiable assets | $ 22,965 |  | $ 22,965 |  | $ 45,322

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