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Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract] |
Disaggregation of Revenue [Table Text Block] |
| Year Ended September 30,
| 2021 |  | 2020 |  | 2019
Communications | $ | 445,968 |  |  | $ | 395,141 |  |  | $ | 321,246 |
Residential |  |  |  |  |
Single-family | 454,449 |  |  | 239,140 |  |  | 212,358 |
Multi-family and Other | 232,898 |  |  | 172,650 |  |  | 100,978 |
Total Residential | 687,347 |  |  | 411,790 |  |  | 313,336 |
Infrastructure Solutions |  |  |  |  |
Industrial Services | 44,427 |  |  | 40,701 |  |  | 48,948 |
Custom Power Solutions | 102,553 |  |  | 87,678 |  |  | 87,842 |
Total Infrastructure Solutions | 146,980 |  |  | 128,379 |  |  | 136,790 |
Commercial & Industrial | 256,198 |  |  | 255,546 |  |  | 305,624 |
Total Revenue | $ | 1,536,493 |  |  | $ | 1,190,856 |  |  | $ | 1,076,996 |
|  | Year Ended September 30, 2021
|  |  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 327,496 |  |  | $ | 687,347 |  |  | $ | 139,532 |  |  | $ | 243,546 |  |  | $ | 1,397,921 |
Time-and-material |  | 118,472 |  |  | — |  |  | 7,448 |  |  | 12,652 |  |  | 138,572 |
Total revenue |  | $ | 445,968 |  |  | $ | 687,347 |  |  | $ | 146,980 |  |  | $ | 256,198 |  |  | $ | 1,536,493 |
|  | Year Ended September 30, 2020
|  |  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 309,567 |  |  | $ | 411,790 |  |  | $ | 121,922 |  |  | $ | 241,864 |  |  | $ | 1,085,143 |
Time-and-material |  | 85,574 |  |  | — |  |  | 6,457 |  |  | 13,682 |  |  | 105,713 |
Total revenue |  | $ | 395,141 |  |  | $ | 411,790 |  |  | $ | 128,379 |  |  | $ | 255,546 |  |  | $ | 1,190,856 |
|  | Year Ended September 30, 2019
|  |  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 229,143 |  |  | $ | 313,336 |  |  | $ | 129,096 |  |  | $ | 286,319 |  |  | $ | 957,894 |
Time-and-material |  | 92,103 |  |  | — |  |  | 7,694 |  |  | 19,305 |  |  | 119,102 |
Total revenue |  | $ | 321,246 |  |  | $ | 313,336 |  |  | $ | 136,790 |  |  | $ | 305,624 |  |  | $ | 1,076,996 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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