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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] |
|  | Commercial & Industrial |  |  | Communications |  | Infrastructure Solutions |  |  | Residential |  | Total
Goodwill at September 30, 2018 |  | $ | 6,976 |  |  |  | $ | 2,816 |  |  | $ | 30,931 |  |  |  | $ | 9,979 |  |  | $ | 50,702 |
Divestitures (See Note 14) |  |  | — |  |  |  |  | — |  |  |  | (119 | ) |  |  |  | — |  |  |  | (119 | )
Adjustments |  |  | — |  |  |  |  | — |  |  |  | — |  |  |  |  | 39 |  |  |  | 39 |
Goodwill at June 30, 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) |  | June 30, 2019
|  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5-20 |  | $ | 5,084 |  |  | $ | (1,163 | ) |  | $ | 3,921 |
Technical library |  | 20 |  |  | 400 |  |  |  | (116 | ) |  |  | 284 |
Customer relationships |  | 6-15 |  |  | 33,539 |  |  |  | (10,256 | ) |  |  | 23,283 |
Non-competition arrangements |  | 5 |  |  | 40 |  |  |  | (7 | ) |  |  | 33 |
Backlog |  | 1 |  |  | 378 |  |  |  | (362 | ) |  |  | 16 |
Construction contracts |  | 1 |  |  | 221 |  |  |  | (223 | ) |  |  | (2 | )
Total intangible assets |  |  |  | $ | 39,662 |  |  | $ | (12,127 | ) |  | $ | 27,535 |
|  |  | Estimated Useful Lives (in Years) |  | September 30, 2018
|  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5-20 |  | $ | 5,084 |  |  | $ | (831 | ) |  | $ | 4,253 |
Technical library |  | 20 |  |  | 400 |  |  |  | (101 | ) |  |  | 299 |
Customer relationships |  | 6-15 |  |  | 33,539 |  |  |  | (7,870 | ) |  |  | 25,669 |
Non-competition arrangements |  | 5 |  |  | 40 |  |  |  | (1 | ) |  |  | 39 |
Backlog |  | 1 |  |  | 378 |  |  |  | (176 | ) |  |  | 202 |
Construction contracts |  | 1 |  |  | 2,184 |  |  |  | (2,056 | ) |  |  | 128 |
Total intangible assets |  |  |  | $ | 41,625 |  |  | $ | (11,035 | ) |  | $ | 30,590 |

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