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Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |
Goodwill | $ 12,753 | $ 12,388
Accumulated impairment losses | (1,348) | (1,269)
Goodwill [Roll Forward] |  |
Carrying value | 11,119 |
Net exchange differences | 286 |
Carrying value | 11,405 |
Solar |  |
Goodwill [Line Items] |  |
Goodwill | 6,962 | 6,597
Accumulated impairment losses | (1,348) | (1,269)
Goodwill [Roll Forward] |  |
Carrying value | 5,328 |
Net exchange differences | 286 |
Carrying value | 5,614 |
Semiconductor |  |
Goodwill [Line Items] |  |
Goodwill | 5,063 | 5,063
Accumulated impairment losses | 0 | 0
Goodwill [Roll Forward] |  |
Carrying value | 5,063 |
Net exchange differences | 0 |
Carrying value | 5,063 |
Polishing |  |
Goodwill [Line Items] |  |
Goodwill | 728 | 728
Accumulated impairment losses | 0 | $ 0
Goodwill [Roll Forward] |  |
Carrying value | 728 |
Net exchange differences | 0 |
Carrying value | $ 728 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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