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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Dec. 31, 2019
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 |
Divestitures |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |
Adjustments |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  | — |
Goodwill at December 31, 2019 |  | $ | 6,976 |  |  |  | $ | 2,816 |  |  | $ | 30,812 |  |  |  | $ | 10,018 |  |  | $ | 50,622 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  | Estimated Useful Lives (in Years) |  | December 31, 2019
|  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5-20 |  | $ | 5,044 |  |  | $ | (1,328 | ) |  | $ | 3,716 |
Technical library |  | 20 |  |  | 400 |  |  |  | (126 | ) |  |  | 274 |
Customer relationships |  | 6-15 |  |  | 33,539 |  |  |  | (11,825 | ) |  |  | 21,714 |
Non-competition arrangements |  | 5 |  |  | 40 |  |  |  | (11 | ) |  |  | 29 |
Backlog and construction contracts |  | 1 |  |  | 251 |  |  |  | (244 | ) |  |  | 7 |
Total intangible assets |  |  |  | $ | 39,274 |  |  | $ | (13,534 | ) |  | $ | 25,740 |
|  |  | 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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