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Goodwill and other Identifiable Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Amortizable Identifiable Intangible Assets | 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 |
Schedule of Amortization Expense | 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 |
Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets | 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 |
Schedule of Changes in Carrying Amount of 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 |

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