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Goodwill and other Identifiable Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Amortizable Identifiable Intangible Assets | Amortizable identifiable intangible assets, net as of September 30, 2020 and 2019 were comprised of the following (in thousands):
| September 30, 2020 |  | September 30, 2019
| Gross carrying amount |  | Accum. amort. |  | Net |  | Gross carrying amount |  | Accum. amort. |  | Net
Purchased and core technology | $ | 76,011 |  |  | $ | (55,482) |  |  | $ | 20,529 |  |  | $ | 57,699 |  |  | $ | (50,986) |  |  | $ | 6,713 |
License agreements | 112 |  |  | (112) |  |  | — |  |  | 102 |  |  | (74) |  |  | 28 |
Patents and trademarks | 22,836 |  |  | (13,535) |  |  | 9,301 |  |  | 14,577 |  |  | (11,970) |  |  | 2,607 |
Customer relationships | 125,500 |  |  | (34,232) |  |  | 91,268 |  |  | 46,315 |  |  | (25,266) |  |  | 21,049 |
Non-compete agreements | 600 |  |  | (450) |  |  | 150 |  |  | 600 |  |  | (330) |  |  | 270 |
Order backlog | — |  |  | — |  |  | — |  |  | 1,800 |  |  | (1,800) |  |  | — |
Total | $ | 225,059 |  |  | $ | (103,811) |  |  | $ | 121,248 |  |  | $ | 121,093 |  |  | $ | (90,426) |  |  | $ | 30,667 |
Schedule of Amortization Expense | Amortization expense for fiscal years 2020, 2019 and 2018 was as follows (in thousands):
Fiscal year | Total
2020 | $ | 14,754 |
2019 | $ | 8,818 |
2018 | $ | 9,435 |
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
2021 | $ | 15,558 |
2022 | $ | 14,714 |
2023 | $ | 12,518 |
2024 | $ | 11,815 |
2025 | $ | 8,358 |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill by reportable segments are (in thousands):
| IoT Products & Services |  | IoT Solutions |  | Total
Balance on September 30, 2018 | $ | 104,358 |  |  | $ | 50,177 |  |  | $ | 154,535 |
Foreign currency translation adjustment | (839) |  |  | (274) |  |  | (1,113) |
Balance on September 30, 2019 | $ | 103,519 |  |  | $ | 49,903 |  |  | $ | 153,422 |
Acquisition | 56,242 |  |  | — |  |  | 56,242 |
Foreign currency translation adjustment | 604 |  |  | (133) |  |  | 471 |
Balance at September 30, 2020 | $ | 160,365 |  |  | $ | 49,770 |  |  | $ | 210,135 |

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