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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |  |
Goodwill, gross |  | $ 12,517 | $ 12,388
Accumulated impairment losses |  | (1,297) | (1,269)
Goodwill, net | $ 11,119 | 11,220 | 11,119
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 11,119 |  |
Net foreign exchange differences | 101 |  |
Goodwill, end of period | 11,220 |  |
Solar |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  | 6,726 | 6,597
Accumulated impairment losses |  | (1,297) | (1,269)
Goodwill, net | 5,328 | 5,429 | 5,328
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 5,328 |  |
Net foreign exchange differences | 101 |  |
Goodwill, end of period | 5,429 |  |
Semiconductor |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  | 5,063 | 5,063
Accumulated impairment losses |  | 0 | 0
Goodwill, net | 5,063 | 5,063 | 5,063
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 5,063 |  |
Net foreign exchange differences | 0 |  |
Goodwill, end of period | 5,063 |  |
Polishing |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross |  | 728 | 728
Accumulated impairment losses |  | 0 | 0
Goodwill, net | 728 | $ 728 | $ 728
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 728 |  |
Net foreign exchange differences | 0 |  |
Goodwill, end of period | $ 728 |  |

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