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Goodwill and other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 122,910 | $ 86,308
Accumulated amortization | (83,590) | (74,508)
Net | 39,320 | 11,800
Purchased and Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 58,102 | 51,292
Accumulated amortization | (48,693) | (46,304)
Net | 9,409 | 4,988
License Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 102 | 18
Accumulated amortization | (46) | (17)
Net | 56 | 1
Patents and Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 15,701 | 12,484
Accumulated amortization | (12,242) | (11,280)
Net | 3,459 | 1,204
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 46,605 | 21,914
Accumulated amortization | (21,049) | (16,817)
Net | 25,556 | 5,097
Non-compete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 600 | 600
Accumulated amortization | (210) | (90)
Net | 390 | 510
Order backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,800 | 0
Accumulated amortization | (1,350) | 0
Net | $ 450 | $ 0

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