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Goodwill and Intangible Assets | 3 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | 11. GOODWILL AND INTANGIBLE ASSETS Goodwill The following summarizes changes in the carrying value of goodwill by segment for the three months ended December 31, 2020:
| Communications |  |  | Residential |  | Infrastructure Solutions |  |  | Commercial & Industrial |  | Total
Goodwill at September 30, 2020 |  | $ | 2,816 |  |  |  | $ | 16,219 |  |  | $ | 34,728 |  |  |  | $ | — |  |  | $ | 53,763 |
Acquisitions |  |  | — |  |  |  |  | 28,121 |  |  |  | 4,565 |  |  |  |  | — |  |  |  | 32,686 |
Goodwill at December 31, 2020 |  | $ | 2,816 |  |  |  | $ | 44,340 |  |  | $ | 39,293 |  |  |  | $ | — |  |  | $ | 86,449 |
Intangible Assets Intangible assets consist of the following:
|  |  | Estimated Useful Lives (in Years) |  | December 31, 2020
|  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5 | - | 20 |  | $ | 18,451 |  |  | $ | (1,898) |  |  | $ | 16,553 |
Technical library |  | 20 |  |  | 400 |  |  |  | (146) |  |  |  | 254 |
Customer relationships |  | 6 | - | 15 |  |  | 59,641 |  |  |  | (15,986) |  |  |  | 43,655 |
Non-competition arrangements |  | 5 |  |  | 40 |  |  |  | (19) |  |  |  | 21 |
Backlog and construction contracts |  | 1 |  |  | 5,240 |  |  |  | (2,900) |  |  |  | 2,340 |
Total intangible assets |  |  |  |  |  | $ | 83,772 |  |  | $ | (20,949) |  |  | $ | 62,823 |
|  |  | Estimated Useful Lives (in Years) |  | September 30, 2020
|  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5 | - | 20 |  | $ | 7,754 |  |  | $ | (1,741) |  |  | $ | 6,013 |
Technical library |  | 20 |  |  | 400 |  |  |  | (141) |  |  |  | 259 |
Customer relationships |  | 6 | - | 15 |  |  | 46,449 |  |  |  | (14,900) |  |  |  | 31,549 |
Non-competition arrangements |  | 5 |  |  | 40 |  |  |  | (17) |  |  |  | 23 |
Backlog and construction contracts |  | 1 |  |  | 3,383 |  |  |  | (1,870) |  |  |  | 1,513 |
Total intangible assets |  |  |  |  |  | $ | 58,026 |  |  | $ | (18,669) |  |  | $ | 39,357 |

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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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