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Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year |  | $ 13,043
Goodwill, accumulated impairment loss, beginning of year |  | (4,720)
Goodwill, net, beginning of year |  | 8,323
Goodwill recognized due to acquisitions |  | 7,681
Goodwill derecognized due to deconsolidation |  | (5,198)
Exchange differences, net |  | (271)
Goodwill, gross, end of year | $ 15,090 | 15,090
Goodwill, accumulated impairment loss, end of year | (4,555) | (4,555)
Goodwill, net, end of year | 10,535 | 10,535
Solar |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year |  | 12,315
Goodwill, accumulated impairment loss, beginning of year |  | (4,720)
Goodwill, net, beginning of year |  | 7,595
Goodwill recognized due to acquisitions |  | 3,218
Exchange differences, net |  | (271)
Goodwill, gross, end of year | 9,899 | 9,899
Goodwill, accumulated impairment loss, end of year | (4,555) | (4,555)
Goodwill, net, end of year | 5,344 | 5,344
Semiconductor |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year |  | $ 0
Goodwill, accumulated impairment loss, beginning of year |  |
Goodwill, net, beginning of year |  | $ 0
Goodwill recognized due to acquisitions |  | 4,463
Goodwill derecognized due to deconsolidation |  | 0
Exchange differences, net |  | 0
Goodwill, gross, end of year | 4,463 | 4,463
Goodwill, accumulated impairment loss, end of year | 0 | 0
Goodwill, net, end of year | 4,463 | 4,463
Polishing |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning of year |  | 728
Goodwill, accumulated impairment loss, beginning of year |  | 0
Goodwill, net, beginning of year |  | 728
Goodwill recognized due to acquisitions |  | 0
Goodwill derecognized due to deconsolidation |  | 0
Exchange differences, net |  | 0
Goodwill, gross, end of year | 728 | 728
Goodwill, accumulated impairment loss, end of year | 0 | 0
Goodwill, net, end of year | 728 | $ 728
SoLayTec, B.V. |  |
Segment Reporting Information [Line Items] |  |
Goodwill, Increase (Decrease) | 900 |
BTU International, Inc (BTU) |  |
Segment Reporting Information [Line Items] |  |
Goodwill, Increase (Decrease) | $ (200) |

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