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Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Goodwill [Line Items] |  |  |
Goodwill | $ 13,469 | $ 13,469 | $ 12,753
Accumulated impairment losses | (6,836) | (6,836) | (1,348)
Goodwill [Roll Forward] |  |  |
Carrying value |  | 11,405 |
Impairment of goodwill |  | (5,663) |
Net exchange differences |  | 891 |
Carrying value | 6,633 | 6,633 |
Solar |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 6,836 | 6,836 | 6,962
Accumulated impairment losses | (6,836) | (6,836) | (1,348)
Goodwill [Roll Forward] |  |  |
Carrying value |  | 5,614 |
Impairment of goodwill | (5,700) | (5,663) |
Net exchange differences |  | 49 |
Carrying value | 0 | 0 |
Semiconductor |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 5,905 | 5,905 | 5,063
Accumulated impairment losses | 0 | 0 | 0
Goodwill [Roll Forward] |  |  |
Carrying value |  | 5,063 |
Impairment of goodwill |  | 0 |
Net exchange differences |  | 842 |
Carrying value | 5,905 | 5,905 |
Polishing |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 728 | 728 | 728
Accumulated impairment losses | 0 | 0 | $ 0
Goodwill [Roll Forward] |  |  |
Carrying value |  | 728 |
Impairment of goodwill |  | 0 |
Net exchange differences |  | 0 |
Carrying value | $ 728 | $ 728 |

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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