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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Jan. 30, 2015
Business Acquisition [Line Items] |  |  |
Goodwill | $ 10,535 | $ 8,323 |
Goodwill recognized due to acquisitions | 7,681 |  |
BTU International, Inc (BTU) Merger |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of net tangible assets acquired |  |  | $ 19,232
Goodwill |  |  | 4,463
Identifiable intangible assets |  |  | 2,930
Total consideration allocated |  |  | $ 26,625
Transaction-related expenses | 4,000 | 1,300 |
Trade names | BTU International, Inc (BTU) Merger |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 1,200 |  |
Useful Life (in years) | 15 years |  |
Customer lists |  |  |
Business Acquisition [Line Items] |  |  |
Useful Life (in years) | 10 years |  |
Customer lists | BTU International, Inc (BTU) Merger |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 1,700 |  |
Useful Life (in years) | 6 years |  |
Semiconductor |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 4,463 | $ 0 |
Goodwill recognized due to acquisitions | 4,463 |  |
Semiconductor | BTU International, Inc (BTU) Merger |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill recognized due to acquisitions | $ 4,500 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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