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Goodwill and Intangible Assets | 12 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | 17. GOODWILL AND INTANGIBLE ASSETS Goodwill The following summarizes the carrying value of goodwill by segment at September 30, 2023, which was unchanged during the years ended September 30, 2023 and 2022:
| Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Balance at September 30, 2023 | $ | 2,816 |  |  | $ | 51,370 |  |  | $ | 38,209 |  |  | $ | — |  |  | $ | 92,395 |
Based on the results of our annual goodwill impairment assessment at September 30, 2023, 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, 2023. As of September 30, 2023 and 2022, we had accumulated impairment losses of $6,976 related to our Commercial & Industrial segment. Intangible Assets Intangible assets consist of the following:
|  |  |  |  | September 30, 2023
| Estimated Useful Lives (in Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Trademarks/trade names | 5 | - | 20 |  | $ | 14,621 |  |  | $ | (6,973) |  |  | $ | 7,648 |
Technical library | 20 |  | 400 |  |  | (201) |  |  | 199 |
Customer relationships | 6 | - | 15 |  | 91,426 |  |  | (43,065) |  |  | 48,361 |
Non-competition arrangements | 5 |  | 40 |  |  | (40) |  |  | — |
Backlog and construction contracts | 1 |  | 4,958 |  |  | (4,958) |  |  | — |
Total |  |  | $ | 111,445 |  |  | $ | (55,237) |  |  | $ | 56,208 |
|  |  |  |  | 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 |
For the years ended September 30, 2023, 2022 and 2021, amortization expense of intangible assets was $13,684, $13,666 and $13,191, respectively. Our estimated future amortization expense for years ending September 30 is as follows:
Year Ending September 30,
2024 | $ | 12,265 |
2025 | 12,081 |
2026 | 11,760 |
2027 | 8,391 |
2028 | 5,416 |
Thereafter | 6,295 |
Total | $ | 56,208 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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