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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 76,038 | $ 73,934
Accumulated amortization | (71,615) | (71,286)
Net | 4,423 | 2,648
Purchased and Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 46,772 | 45,449
Accumulated amortization | (45,050) | (45,424)
Net | 1,722 | 25
License Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 18 | 18
Accumulated amortization | (4) | (4)
Net | 14 | 14
Patents and Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 11,689 | 11,377
Accumulated amortization | (10,858) | (10,385)
Net | 831 | 992
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 17,559 | 17,090
Accumulated amortization | (15,703) | (15,473)
Net | $ 1,856 | $ 1,617

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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