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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | $ 11,808 |
Accumulated impairment losses | (1,273) |
Goodwill, net, beginning of year | 11,188 | $ 10,535
Goodwill recognized due to acquisitions | 600 |
Net foreign exchange differences | 53 |
Goodwill, gross, end of quarter | 12,476 |
Accumulated impairment losses | (1,288) |
Goodwill, net, end of quarter | 11,188 |
Operating Segments | Solar |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | 6,617 |
Accumulated impairment losses | (1,273) |
Goodwill, net, beginning of year | 5,397 | 5,344
Goodwill recognized due to acquisitions | 0 |
Net foreign exchange differences | 53 |
Goodwill, gross, end of quarter | 6,685 |
Accumulated impairment losses | (1,288) |
Goodwill, net, end of quarter | 5,397 |
Operating Segments | Semiconductor |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | 4,463 |
Accumulated impairment losses | 0 |
Goodwill, net, beginning of year | 5,063 | 4,463
Goodwill recognized due to acquisitions | 600 |
Net foreign exchange differences | 0 |
Goodwill, gross, end of quarter | 5,063 |
Accumulated impairment losses | 0 |
Goodwill, net, end of quarter | 5,063 |
Operating Segments | Polishing |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year | 728 |
Accumulated impairment losses | 0 |
Goodwill, net, beginning of year | 728 | $ 728
Goodwill recognized due to acquisitions | 0 |
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 of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 + Details
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