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Goodwill and Other Identifiable Intangible Assets, Net (Tables) | 6 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Amortizable Identifiable Intangible Assets | Amortizable identifiable intangible assets were (in thousands):
| March 31, 2018 |  | September 30, 2017
| Gross carrying amount |  | Accum. amort. |  | Net |  | Gross carrying amount |  | Accum. amort. |  | Net
Purchased and core technology | $ | 58,541 |  |  | $ | (47,787 | ) |  | $ | 10,754 |  |  | $ | 51,292 |  |  | $ | (46,304 | ) |  | $ | 4,988 |
License agreements | 102 |  |  | (32 | ) |  | 70 |  |  | 18 |  |  | (17 | ) |  | 1 |
Patents and trademarks | 15,542 |  |  | (11,701 | ) |  | 3,841 |  |  | 12,484 |  |  | (11,280 | ) |  | 1,204 |
Customer relationships | 46,918 |  |  | (19,082 | ) |  | 27,836 |  |  | 21,914 |  |  | (16,817 | ) |  | 5,097 |
Non-compete agreements | 600 |  |  | (150 | ) |  | 450 |  |  | 600 |  |  | (90 | ) |  | 510 |
Order backlog | 1,800 |  |  | (450 | ) |  | 1,350 |  |  | — |  |  | — |  |  | — |
Total | $ | 123,503 |  |  | $ | (79,202 | ) |  | $ | 44,301 |  |  | $ | 86,308 |  |  | $ | (74,508 | ) |  | $ | 11,800 |
Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets | Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2018 and the five succeeding fiscal years is (in thousands):
2018 (six months) | $ | 4,945 |
2019 | 8,360 |
2020 | 7,595 |
2021 | 7,130 |
2022 | 6,758 |
2023 | 4,751 |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill are (in thousands):
| Six months ended March 31,
| 2018 |  | 2017
Beginning balance, October 1 | $ | 131,995 |  |  | $ | 109,448 |
Acquisitions | 23,614 |  |  | 21,206 |
Foreign currency translation adjustment | 373 |  |  | (733 | )
Ending balance, March 31 | $ | 155,982 |  |  | $ | 129,921 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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