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Goodwill and other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 121,093 | $ 122,910 |
Accumulated amortization | (90,426) | (83,590) |
Net | 30,667 | 39,320 | [1]
Purchased and Core Technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 57,699 | 58,102 |
Accumulated amortization | (50,986) | (48,693) |
Net | 6,713 | 9,409 |
License Agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 102 | 102 |
Accumulated amortization | (74) | (46) |
Net | 28 | 56 |
Patents and Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 14,577 | 15,701 |
Accumulated amortization | (11,970) | (12,242) |
Net | 2,607 | 3,459 |
Customer Relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 46,315 | 46,605 |
Accumulated amortization | (25,266) | (21,049) |
Net | 21,049 | 25,556 |
Non-compete Agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 600 | 600 |
Accumulated amortization | (330) | (210) |
Net | 270 | 390 |
Order backlog |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,800 | 1,800 |
Accumulated amortization | (1,800) | (1,350) |
Net | $ 0 | $ 450 |
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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