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Goodwill | 12 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | Goodwill The changes in the carrying amount of goodwill for the year ended September 30, 2017 are as follows.
| Solar |  | Semiconductor |  | Polishing |  | Total
| (dollars in thousands)
Goodwill | $ | 6,597 |  |  | $ | 5,063 |  |  | $ | 728 |  |  | $ | 12,388 |
Accumulated impairment losses | (1,269 | ) |  | — |  |  | — |  |  | (1,269 | )
Carrying value at September 30, 2016 | 5,328 |  |  | 5,063 |  |  | 728 |  |  | 11,119 |
Net exchange differences | 286 |  |  | — |  |  | — |  |  | 286 |
Carrying value at September 30, 2017 | $ | 5,614 |  |  | $ | 5,063 |  |  | $ | 728 |  |  | $ | 11,405 |
Goodwill | $ | 6,962 |  |  | $ | 5,063 |  |  | $ | 728 |  |  | $ | 12,753 |
Accumulated impairment losses | (1,348 | ) |  | — |  |  | — |  |  | (1,348 | )
Carrying value at September 30, 2017 | $ | 5,614 |  |  | $ | 5,063 |  |  | $ | 728 |  |  | $ | 11,405 |
During 2017, we periodically assessed whether any indicators of impairment existed which would require us to perform an interim impairment review. As of each interim period end during the year, we concluded that a triggering event had not occurred that would more likely than not reduce the fair value of our reporting units below their carrying values. We performed our annual test of goodwill for impairment during the fourth quarter of 2017. The results of the first step of the goodwill impairment test indicated that the fair values of our reporting units were in excess of their respective carrying values, and thus we did not require an impairment charge.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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