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Goodwill (Tables) | 12 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the year ended September 30, 2018 are as follows (in thousands):
| Solar |  | Semiconductor |  | Polishing |  | Total
Goodwill | $ | 6,962 |  |  | $ | 5,063 |  |  | $ | 728 |  |  | $ | 12,753 |
Accumulated impairment losses | (1,348 | ) |  | — |  |  | — |  |  | (1,348 | )
Balance at September 30, 2017 | 5,614 |  |  | 5,063 |  |  | 728 |  |  | 11,405 |
Impairment of goodwill | (5,663 | ) |  | — |  |  | — |  |  | (5,663 | )
Net exchange differences | 49 |  |  | 842 |  |  | — |  |  | 891 |
Balance at September 30, 2018 | $ | — |  |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | 6,633 |
Goodwill | $ | 6,836 |  |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | 13,469 |
Accumulated impairment losses | (6,836 | ) |  | — |  |  | — |  |  | (6,836 | )
Balance at September 30, 2018 | $ | — |  |  | $ | 5,905 |  |  | $ | 728 |  |  | $ | 6,633 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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