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Goodwill and Other Identifiable Intangible Assets, Net (Tables) | 3 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Amortizable Identifiable Intangible Assets | Amortizable identifiable intangible assets were (in thousands):
| December 31, 2018 |  | September 30, 2018
| Gross carrying amount |  | Accum. amort. |  | Net |  | Gross carrying amount |  | Accum. amort. |  | Net
Purchased and core technology | $ | 57,821 |  |  | $ | (49,113 | ) |  | $ | 8,708 |  |  | $ | 58,102 |  |  | $ | (48,693 | ) |  | $ | 9,409 |
License agreements | 102 |  |  | (53 | ) |  | 49 |  |  | 102 |  |  | (46 | ) |  | 56 |
Patents and trademarks | 15,748 |  |  | (12,501 | ) |  | 3,247 |  |  | 15,701 |  |  | (12,242 | ) |  | 3,459 |
Customer relationships | 46,432 |  |  | (22,024 | ) |  | 24,408 |  |  | 46,605 |  |  | (21,049 | ) |  | 25,556 |
Non-compete agreements | 600 |  |  | (240 | ) |  | 360 |  |  | 600 |  |  | (210 | ) |  | 390 |
Order backlog | 1,800 |  |  | (1,800 | ) |  | — |  |  | 1,800 |  |  | (1,350 | ) |  | 450 |
Total | $ | 122,503 |  |  | $ | (85,731 | ) |  | $ | 36,772 |  |  | $ | 122,910 |  |  | $ | (83,590 | ) |  | $ | 39,320 |
Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets | Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2019 and the five succeeding fiscal years is (in thousands):
2019 (nine months) | $ | 6,283 |
2020 | 8,297 |
2021 | 7,722 |
2022 | 6,853 |
2023 | 4,668 |
2024 | 3,995 |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill are (in thousands):
| Three months ended December 31,
| 2018 |  | 2017
Beginning balance, October 1 | $ | 154,535 |  |  | $ | 131,995 |
Acquisitions | — |  |  | 17,341 |
Foreign currency translation adjustment | (957 | ) |  | (3 | )
Ending balance, December 31 | $ | 153,578 |  |  | $ | 149,333 |

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