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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 123,503 | $ 86,308
Accumulated amortization | (79,202) | (74,508)
Net | 44,301 | 11,800
Purchased and Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 58,541 | 51,292
Accumulated amortization | (47,787) | (46,304)
Net | 10,754 | 4,988
License Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 102 | 18
Accumulated amortization | (32) | (17)
Net | 70 | 1
Patents and Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 15,542 | 12,484
Accumulated amortization | (11,701) | (11,280)
Net | 3,841 | 1,204
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 46,918 | 21,914
Accumulated amortization | (19,082) | (16,817)
Net | 27,836 | 5,097
Non-compete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 600 | 600
Accumulated amortization | (150) | (90)
Net | 450 | 510
Order backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,800 | 0
Accumulated amortization | (450) | 0
Net | $ 1,350 | $ 0

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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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