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Goodwill and other Identifiable Intangible Assets | 12 Months Ended
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Sep. 30, 2019
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, 2019 and 2018 were comprised of the following (in thousands):
| September 30, 2019 |  | September 30, 2018
| Gross carrying amount |  | Accum. amort. |  | Net |  | Gross carrying amount |  | Accum. amort. |  | Net
Purchased and core technology | $ | 57,699 |  |  | $ | (50,986 | ) |  | $ | 6,713 |  |  | $ | 58,102 |  |  | $ | (48,693 | ) |  | $ | 9,409 |
License agreements | 102 |  |  | (74 | ) |  | 28 |  |  | 102 |  |  | (46 | ) |  | 56 |
Patents and trademarks | 14,577 |  |  | (11,970 | ) |  | 2,607 |  |  | 15,701 |  |  | (12,242 | ) |  | 3,459 |
Customer relationships | 46,315 |  |  | (25,266 | ) |  | 21,049 |  |  | 46,605 |  |  | (21,049 | ) |  | 25,556 |
Non-compete agreements | 600 |  |  | (330 | ) |  | 270 |  |  | 600 |  |  | (210 | ) |  | 390 |
Order backlog | 1,800 |  |  | (1,800 | ) |  | — |  |  | 1,800 |  |  | (1,350 | ) |  | 450 |
Total | $ | 121,093 |  |  | $ | (90,426 | ) |  | $ | 30,667 |  |  | $ | 122,910 |  |  | $ | (83,590 | ) |  | $ | 39,320 |
Amortization expense is included in our Consolidated Statements 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 2019, 2018 and 2017 was as follows (in thousands):
Fiscal year | Total
2019 | $ | 8,818 |
2018 | $ | 9,435 |
2017 | $ | 2,597 |
3. GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS, NET (CONTINUED) Estimated amortization expense for the next five years is as follows (in thousands):
Fiscal year | Total
2020 | $ | 8,277 |
2021 | $ | 7,434 |
2022 | $ | 6,590 |
2023 | $ | 4,392 |
2024 | $ | 3,689 |
Goodwill The changes in the carrying amount of goodwill by reportable segments are (in thousands):
| Fiscal years ended September 30,
| IoT Products and Services |  | IoT Solutions |  | Total
Balance on September 30, 2017 | $ | 98,981 |  |  | $ | 33,014 |  |  | $ | 131,995 |
Acquisitions | 5,663 |  |  | 17,553 |  |  | 23,216 |
Foreign currency translation adjustment | (286 | ) |  | (390 | ) |  | (676 | )
Balance on September 30, 2018 | $ | 104,358 |  |  | $ | 50,177 |  |  | $ | 154,535 |
Foreign currency translation adjustment | (839 | ) |  | (274 | ) |  | (1,113 | )
Balance at September 30, 2019 | $ | 103,519 |  |  | $ | 49,903 |  |  | $ | 153,422 |
No goodwill impairment has been recorded in any period presented.

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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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