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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The following summarizes changes in the carrying value of goodwill by segment during the six months ended March 31, 2025:
| Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Goodwill at September 30, 2024 |  | $ | 2,816 |  |  | $ | 51,370 |  |  | $ | 39,774 |  |  | $ | — |  |  | $ | 93,960 |
Acquisitions |  | — |  |  | — |  |  | 1,266 |  | (1) | — |  |  | 1,266 |
Goodwill at March 31, 2025 |  | $ | 2,816 |  |  | $ | 51,370 |  |  | $ | 41,040 |  |  | $ | — |  |  | $ | 95,226 |
(1) On January 31, 2025, the Company acquired all of the equity interests of Arrow Engine Company for a purchase price of $22,067. The fair value of the total consideration for this transaction and the amount of goodwill acquired remains subject to post-closing adjustments as of the date of this report.
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible assets consist of the following:
|  | Estimated Useful Lives (in Years) |  | March 31, 2025
|  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5 | - | 20 |  |  | $ | 15,121 |  |  |  | $ | (7,719) |  |  |  | $ | 7,402 |
Technical library |  | 20 |  |  | 400 |  |  |  | (231) |  |  |  | 169 |
Customer relationships |  | 1 | - | 15 |  |  | 94,746 |  |  |  | (60,545) |  |  |  | 34,201 |
Backlog and construction contracts |  | 1 | - | 2 |  |  | 750 |  |  |  | (441) |  |  |  | 309 |
Total intangible assets |  |  |  |  |  |  | $ | 111,017 |  |  |  | $ | (68,936) |  |  |  | $ | 42,081 |
|  |  | Estimated Useful Lives (in Years) |  | September 30, 2024
|  |  |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net
Trademarks/trade names |  | 5 | - | 20 |  |  | $ | 13,821 |  |  |  | $ | (6,964) |  |  |  | $ | 6,857 |
Technical library |  | 20 |  |  | 400 |  |  |  | (221) |  |  |  | 179 |
Customer relationships |  | 1 | - | 15 |  |  | 92,796 |  |  |  | (54,478) |  |  |  | 38,318 |
Backlog and construction contracts |  | 1 | - | 2 |  |  | 750 |  |  |  | (214) |  |  |  | 536 |
Total intangible assets |  |  |  |  |  |  | $ | 107,767 |  |  |  | $ | (61,877) |  |  |  | $ | 45,890 |

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