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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 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 |  |  | — |  |  |  |  | — |  |  |  | 3,906 |  |  |  |  | 6,014 |  |  |  | 9,920 |
Divestitures |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |
Adjustments |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  | — |
Goodwill at March 31, 2020 |  |  | $ | 6,976 |  |  |  | $ |  | 2,816 |  |  | $ |  | 34,718 |  |  |  | $ |  | 16,032 |  |  | $ |  | 60,542 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  | Estimated Useful Lives (in Years) |  | March 31, 2020 |  |  |  |  |  |  |
|  |  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net |
Trademarks/trade names |  |  | 5-20 |  | $ | 7,854 |  |  | $ |  | (1,446) |  |  | $ |  | 6,408 |
Technical library |  |  | 20 |  |  | 400 |  |  |  | (131) |  |  |  | 269 |
Customer relationships |  |  | 6-15 |  |  | 46,189 |  |  |  | (12,779) |  |  |  | 33,410 |
Non-competition arrangements |  |  | 5 |  |  | 1,300 |  |  |  | (34) |  |  |  | 1,266 |
Backlog and construction contracts |  |  | 1 |  |  | 3,274 |  |  |  | (817) |  |  |  | 2,457 |
Total intangible assets |  |  |  |  | $ | 59,017 |  |  | $ |  | (15,207) |  |  | $ |  | 43,810 |
|  |  | 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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