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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 75,545 | $ 75,694
Accumulated amortization | (71,246) | (71,653)
Net | 4,299 | 4,041
Purchased and Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 46,558 | 46,594
Accumulated amortization | (44,756) | (44,999)
Net | 1,802 | 1,595
License Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 18 | 18
Accumulated amortization | (12) | (10)
Net | 6 | 8
Patents and Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 11,537 | 11,619
Accumulated amortization | (10,846) | (10,871)
Net | 691 | 748
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 17,432 | 17,463
Accumulated amortization | (15,632) | (15,773)
Net | $ 1,800 | $ 1,690

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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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