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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] |
|  | Commercial & Industrial |  |  |  | Communications |  |  | Infrastructure Solutions |  |  |  | Residential |  |  | Total |
Goodwill at September 30, 2019 |  | $ | 6,976 |  |  |  | $ | 2,816 |  |  | $ | 30,812 |  |  |  | $ | 10,018 |  |  | $ | 50,622 |
Acquisitions |  |  | — |  |  |  |  | — |  |  |  | 3,916 |  |  |  |  | 5,946 |  |  |  | 9,862 |
Divestitures |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |
Adjustments |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |
Goodwill at June 30, 2020 |  | $ | 6,976 |  |  |  | $ | 2,816 |  |  | $ | 34,728 |  |  |  | $ | 15,964 |  |  | $ | 60,484 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  | Estimated Useful Lives (in Years) |  | June 30, 2020 |  |  |  |  |  |  |
|  |  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net |
Trademarks/trade names |  |  | 5-20 |  | $ | 7,754 |  |  | $ | (1,593) |  |  | $ | 6,161 |
Technical library |  |  | 20 |  |  | 400 |  |  |  | (136) |  |  |  | 264 |
Customer relationships |  |  | 6-15 |  |  | 46,269 |  |  |  | (13,797) |  |  |  | 32,472 |
Non-competition arrangements |  |  | 5 |  |  | 1,300 |  |  |  | (59) |  |  |  | 1,241 |
Backlog and construction contracts |  |  | 1 |  |  | 3,063 |  |  |  | (1,009) |  |  |  | 2,054 |
Total intangible assets |  |  |  |  | $ | 58,786 |  |  | $ | (16,594) |  |  | $ | 42,192 |
|  |  | Estimated Useful Lives (in Years) |  | September 30, 2019 |  |  |  |  |  |  |
|  |  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net |
Trademarks/trade names |  |  | 5-20 |  | $ | 5,084 |  |  | $ | (1,267) |  |  | $ | 3,817 |
Technical library |  |  | 20 |  |  | 400 |  |  |  | (121) |  |  |  | 279 |
Customer relationships |  |  | 6-15 |  |  | 33,539 |  |  |  | (11,051) |  |  |  | 22,488 |
Non-competition arrangements |  |  | 5 |  |  | 40 |  |  |  | (9) |  |  |  | 31 |
Backlog and construction contracts |  |  | 1 |  |  | 599 |  |  |  | (591) |  |  |  | 8 |
Total intangible assets |  |  |  |  | $ | 39,662 |  |  | $ | (13,039) |  |  | $ | 26,623 |

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