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Goodwill and other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 86,308 | $ 75,694
Accumulated amortization | (74,508) | (71,653)
Net | 11,800 | 4,041
Purchased and Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 51,292 | 46,594
Accumulated amortization | (46,304) | (44,999)
Net | 4,988 | 1,595
License Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 18 | 18
Accumulated amortization | (17) | (10)
Net | 1 | 8
Patents and Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 12,484 | 11,619
Accumulated amortization | (11,280) | (10,871)
Net | 1,204 | 748
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 21,914 | 17,463
Accumulated amortization | (16,817) | (15,773)
Net | 5,097 | 1,690
Noncompete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 600 | 0
Accumulated amortization | (90) | 0
Net | $ 510 | $ 0

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- Definition Accumulated amount of 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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- 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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