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Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Oct. 05, 2015 | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 109,880 | $ 100,183 | $ 100,583 | $ 101,484
Bluenica Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash | $ 2,888 |  |  |  |
Purchase price payable upon completion of diligence matters | 115 |  |  |  |
Fair value of contingent consideration on acquired business | 10,400 |  |  |  |
Total purchase price consideration | 13,403 |  |  |  |
Fair value of net tangible assets acquired | 129 |  |  |  |
Goodwill | 10,985 |  |  |  |
Deferred tax liabilities, net | (611) |  |  |  |
Total assets acquired and liabilities assumed | 13,403 |  |  |  |
Purchased and Core Technology | Bluenica Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | 2,000 |  |  |  |
Customer Relationships | Bluenica Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of identifiable intangible assets acquired | $ 900 |  |  |  |

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