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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | $ 12,388 |
Accumulated impairment losses | (1,269) |
Goodwill, net, beginning of year | 10,867 | $ 11,119
Net foreign exchange differences | (252) |
Goodwill, gross, end of quarter | 12,068 |
Accumulated impairment losses | (1,201) |
Goodwill, net, end of quarter | 10,867 |
Solar |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | 6,597 |
Accumulated impairment losses | (1,269) |
Goodwill, net, beginning of year | 5,076 | 5,328
Net foreign exchange differences | (252) |
Goodwill, gross, end of quarter | 6,277 |
Accumulated impairment losses | (1,201) |
Goodwill, net, end of quarter | 5,076 |
Semiconductor |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | 5,063 |
Accumulated impairment losses | 0 |
Goodwill, net, beginning of year | 5,063 | 5,063
Net foreign exchange differences | 0 |
Goodwill, gross, end of quarter | 5,063 |
Accumulated impairment losses | 0 |
Goodwill, net, end of quarter | 5,063 |
Polishing |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | 728 |
Accumulated impairment losses | 0 |
Goodwill, net, beginning of year | 728 | $ 728
Net foreign exchange differences | 0 |
Goodwill, gross, end of quarter | 728 |
Accumulated impairment losses | 0 |
Goodwill, net, end of quarter | $ 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 -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 + 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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