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Goodwill and Intangible Assets | 12 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | 17. GOODWILL AND INTANGIBLE ASSETS Goodwill The following summarizes changes in the carrying value of goodwill by segment for the years ended September 30, 2022 and 2021:
| Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Balance at September 30, 2020 | $ | 2,816 |  |  | $ | 16,219 |  |  | $ | 34,728 |  |  | $ | — |  |  | $ | 53,763 |
Acquisitions (Note 19) | — |  |  | 35,151 |  |  | 3,481 |  |  | — |  |  | 38,632 |
Balance at September 30, 2021 | 2,816 |  |  | 51,370 |  |  | 38,209 |  |  | — |  |  | 92,395 |
Balance at September 30, 2022 | $ | 2,816 |  |  | $ | 51,370 |  |  | $ | 38,209 |  |  | $ | — |  |  | $ | 92,395 |
Based on the results of our annual goodwill impairment assessment at September 30, 2022, we concluded the fair value of each of our reporting units exceeded its book value, and therefore we recorded no impairment charges for the year ended September 30, 2022. We have an accumulated impairment loss of $6,976 related to our Commercial & Industrial segment. Intangible Assets Intangible assets consist of the following:
|  |  |  |  | September 30, 2022
| Estimated Useful Lives (in Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Trademarks/trade names | 5 | - | 20 |  | $ | 15,262 |  |  | $ | (4,589) |  |  | $ | 10,673 |
Technical library | 20 |  | 400 |  |  | (181) |  |  | 219 |
Customer relationships | 6 | - | 15 |  | 96,699 |  |  | (35,662) |  |  | 61,037 |
Non-competition arrangements | 5 |  | 40 |  |  | (33) |  |  | 7 |
Backlog and construction contracts | 1 |  | 4,958 |  |  | (4,958) |  |  | — |
Total |  |  | $ | 117,359 |  |  | $ | (45,423) |  |  | $ | 71,936 |
|  |  |  |  | September 30, 2021
| Estimated Useful Lives (in Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Trademarks/trade names | 5 | - | 20 |  | $ | 15,262 |  |  | $ | (2,891) |  |  | $ | 12,371 |
Technical library | 20 |  | 400 |  |  | (161) |  |  | 239 |
Customer relationships | 6 | - | 15 |  | 96,879 |  |  | (24,021) |  |  | 72,858 |
Non-competition arrangements | 5 |  | 40 |  |  | (25) |  |  | 15 |
Backlog and construction contracts | 1 |  | 4,957 |  |  | (4,821) |  |  | 136 |
Total |  |  | $ | 117,538 |  |  | $ | (31,919) |  |  | $ | 85,619 |
For the years ended September 30, 2022, 2021, and 2020, amortization expense of intangible assets was $13,666, $13,191 and $6,424, respectively. Our estimated future amortization expense for years ending September 30 is as follows:
Year Ending September 30,
2023 | $ | 13,153 |
2024 | 12,810 |
2025 | 12,370 |
2026 | 12,031 |
2027 | 8,631 |
Thereafter | 12,941 |
Total | $ | 71,936 |

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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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