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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | $ 122,503 |  |  | $ 122,910 |
Accumulated amortization | (85,731) |  |  | (83,590) |
Net | 36,772 |  |  | 39,320 | [1]
Amortization expense | 2,540 | $ 1,694 | [1] |  |
Purchased and Core Technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 57,821 |  |  | 58,102 |
Accumulated amortization | (49,113) |  |  | (48,693) |
Net | 8,708 |  |  | 9,409 |
License Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 102 |  |  | 102 |
Accumulated amortization | (53) |  |  | (46) |
Net | 49 |  |  | 56 |
Patents and Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 15,748 |  |  | 15,701 |
Accumulated amortization | (12,501) |  |  | (12,242) |
Net | 3,247 |  |  | 3,459 |
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 46,432 |  |  | 46,605 |
Accumulated amortization | (22,024) |  |  | (21,049) |
Net | 24,408 |  |  | 25,556 |
Non-compete Agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross carrying amount | 600 |  |  | 600 |
Accumulated amortization | (240) |  |  | (210) |
Net | 360 |  |  | 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 |
Cost of Sales and General and Administrative Expense |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization expense | $ 2,500 | $ 1,700 |  |  |
[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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