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Goodwill and Other Identifiable Intangible Assets, Net (Tables) | 6 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets were (in thousands):
| March 31, 2021 |  | September 30, 2020
| Gross carrying amount |  | Accum. amort. |  | Net |  | Gross carrying amount |  | Accum. amort. |  | Net
Purchased and core technology | $ | 76,517 |  |  | $ | (58,133) |  |  | $ | 18,384 |  |  | $ | 76,011 |  |  | $ | (55,482) |  |  | $ | 20,529 |
License agreements | 112 |  |  | (112) |  |  | — |  |  | 112 |  |  | (112) |  |  | — |
Patents and trademarks | 23,007 |  |  | (14,386) |  |  | 8,621 |  |  | 22,836 |  |  | (13,535) |  |  | 9,301 |
Customer relationships | 125,793 |  |  | (39,376) |  |  | 86,417 |  |  | 125,500 |  |  | (34,232) |  |  | 91,268 |
Non-compete agreements | 600 |  |  | (480) |  |  | 120 |  |  | 600 |  |  | (450) |  |  | 150 |
Total | $ | 226,029 |  |  | $ | (112,487) |  |  | $ | 113,542 |  |  | $ | 225,059 |  |  | $ | (103,811) |  |  | $ | 121,248 |
Schedule of Estimated Future Amortization Expense Related to Intangible Assets | Estimated amortization expense related to intangible assets for the remainder of fiscal 2021 and the five succeeding fiscal years is (in thousands):
2021 (six months) | $ | 7,736 |
2022 | $ | 14,722 |
2023 | $ | 12,518 |
2024 | $ | 11,815 |
2025 | $ | 8,358 |
2026 | $ | 8,126 |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill by reportable segments are (in thousands):
| Six months ended March 31,
| IoT Products and Services |  | IoT Solutions |  | Total
Balance on September 30, 2020 | $ | 160,365 |  |  | $ | 49,770 |  |  | $ | 210,135 |
Acquisition | 15,095 |  |  | — |  |  | 15,095 |
Adjustment (see Note 2) | 846 |  |  | — |  |  | 846 |
Foreign currency translation adjustment | 767 |  |  | 690 |  |  | 1,457 |
Balance at March 31, 2021 | $ | 177,073 |  |  | $ | 50,460 |  |  | $ | 227,533 |

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