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Goodwill and other Identifiable Intangible Assets | 12 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS, NET | GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS, NET Identifiable Intangible Assets, Net Amortizable identifiable intangible assets, net as of September 30, 2018 and 2017 were comprised of the following (in thousands):
| September 30, 2018 |  | September 30, 2017
| Gross carrying amount |  | Accum. amort. |  | Net |  | Gross carrying amount |  | Accum. amort. |  | Net
Purchased and core technology | $ | 58,102 |  |  | $ | (48,693 | ) |  | $ | 9,409 |  |  | $ | 51,292 |  |  | $ | (46,304 | ) |  | $ | 4,988 |
License agreements | 102 |  |  | (46 | ) |  | 56 |  |  | 18 |  |  | (17 | ) |  | 1 |
Patents and trademarks | 15,701 |  |  | (12,242 | ) |  | 3,459 |  |  | 12,484 |  |  | (11,280 | ) |  | 1,204 |
Customer relationships | 46,605 |  |  | (21,049 | ) |  | 25,556 |  |  | 21,914 |  |  | (16,817 | ) |  | 5,097 |
Non-compete agreements | 600 |  |  | (210 | ) |  | 390 |  |  | 600 |  |  | (90 | ) |  | 510 |
Order backlog | 1,800 |  |  | (1,350 | ) |  | 450 |  |  | — |  |  | — |  |  | — |
Total | $ | 122,910 |  |  | $ | (83,590 | ) |  | $ | 39,320 |  |  | $ | 86,308 |  |  | $ | (74,508 | ) |  | $ | 11,800 |
Amortization expense is included in our consolidated statement of operations in cost of sales and general and administrative expense. Amortization expense in cost of sales includes amortization for purchased and core technology and certain patents and trademarks. Amortization expense for fiscal years 2018, 2017 and 2016 was as follows (in thousands):
Fiscal year | Total
2018 | $ | 9,435 |
2017 | $ | 2,597 |
2016 | $ | 1,842 |
Estimated amortization expense for the next five years is as follows (in thousands):
Fiscal year | Total
2019 | $ | 8,888 |
2020 | $ | 8,118 |
2021 | $ | 7,422 |
2022 | $ | 6,554 |
2023 | $ | 4,362 |
4. GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS, NET (CONTINUED) Goodwill The changes in the carrying amount of goodwill were (in thousands):
| Fiscal years ended September 30,
| 2018 |  | 2017
Beginning balance, October 1 | $ | 131,995 |  |  | $ | 109,448 |
Acquisitions | 23,216 |  |  | 21,465 |
Foreign currency translation adjustment | (676 | ) |  | 1,082 |
Ending balance, September 30 | $ | 154,535 |  |  | $ | 131,995 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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