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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] |
| Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Balance at September 30, 2017 | $ | 7,176 |  |  | $ | — |  |  | $ | 30,886 |  |  | $ | 8,631 |  |  | $ | 46,693 |
Acquisitions (Note 19) | — |  |  | 2,892 |  |  | — |  |  | 1,348 |  |  | 4,240 |
Purchase accounting adjustments | (200 | ) |  | (76 | ) |  | 45 |  |  | — |  |  | (231 | )
Balance at September 30, 2018 | 6,976 |  |  | 2,816 |  |  | 30,931 |  |  | 9,979 |  |  | 50,702 |
Divestitures | — |  |  | — |  |  | (119 | ) |  | — |  |  | (119 | )
Purchase accounting adjustments | — |  |  | — |  |  | — |  |  | 39 |  |  | 39 |
Balance at September 30, 2019 | $ | 6,976 |  |  | $ | 2,816 |  |  | $ | 30,812 |  |  | $ | 10,018 |  |  | $ | 50,622 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  | September 30, 2018
| Estimated Useful Lives (in Years) |  | 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 and construction contracts | 1 |  | 2,562 |  |  | (2,232 | ) |  | 330 |
Total |  |  | $ | 41,625 |  |  | $ | (11,035 | ) |  | $ | 30,590 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year Ended September 30,
2020 | $ | 3,222 |
2021 | 3,249 |
2022 | 3,422 |
2023 | 2,785 |
2024 | 2,240 |
Thereafter | 11,705 |
Total | $ | 26,623 |

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