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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | $ 122,878 |  | $ 122,878 |  |  | $ 122,910 |
Accumulated amortization | (88,071) |  | (88,071) |  |  | (83,590) |
Net | 34,807 |  | 34,807 |  |  | 39,320 | [1]
Amortization expense |  |  | 4,609 | $ 4,287 | [1] |  |
Purchased and Core Technology |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | 58,011 |  | 58,011 |  |  | 58,102 |
Accumulated amortization | (49,938) |  | (49,938) |  |  | (48,693) |
Net | 8,073 |  | 8,073 |  |  | 9,409 |
License Agreements |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | 102 |  | 102 |  |  | 102 |
Accumulated amortization | (60) |  | (60) |  |  | (46) |
Net | 42 |  | 42 |  |  | 56 |
Patents and Trademarks |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | 15,835 |  | 15,835 |  |  | 15,701 |
Accumulated amortization | (12,777) |  | (12,777) |  |  | (12,242) |
Net | 3,058 |  | 3,058 |  |  | 3,459 |
Customer Relationships |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | 46,530 |  | 46,530 |  |  | 46,605 |
Accumulated amortization | (23,226) |  | (23,226) |  |  | (21,049) |
Net | 23,304 |  | 23,304 |  |  | 25,556 |
Non-compete Agreements |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | 600 |  | 600 |  |  | 600 |
Accumulated amortization | (270) |  | (270) |  |  | (210) |
Net | 330 |  | 330 |  |  | 390 |
Order backlog |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount | 1,800 |  | 1,800 |  |  | 1,800 |
Accumulated amortization | (1,800) |  | (1,800) |  |  | (1,350) |
Net | 0 |  | 0 |  |  | $ 450 |
Cost of Sales and General and Administrative Expense |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization expense | $ 2,100 | $ 2,600 | $ 4,600 | $ 4,300 |  |  |
[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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