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Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract] |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, |  | Nine Months Ended June 30, |  |
|  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Communications |  | $ | 116,218 |  |  | $ | 96,500 |  |  | $ | 309,460 |  |  | $ | 276,779 |  |  |  |  |
Residential |  |  |  |  |  |  |  |  |  |  |  |
Single-family |  | 102,105 |  |  | 62,239 |  |  | 274,707 |  |  | 176,071 |  |  |  |  |
Multi-family and Other |  | 84,344 |  |  | 45,666 |  |  | 181,569 |  |  | 124,589 |  |  |  |  |
Total Residential |  | 186,449 |  |  | 107,905 |  |  | 456,276 |  |  | 300,660 |  |  |  |  |
Infrastructure Solutions |  |  |  |  |  |  |  |  |  |  |  |
Industrial Services |  | 11,972 |  |  | 9,753 |  |  | 32,560 |  |  | 31,588 |  |  |  |  |
Custom Power Solutions |  | 27,145 |  |  | 22,189 |  |  | 75,674 |  |  | 60,937 |  |  |  |  |
Total Infrastructure Solutions |  | 39,117 |  |  | 31,942 |  |  | 108,234 |  |  | 92,525 |  |  |  |  |
Commercial & Industrial |  | 64,087 |  |  | 56,778 |  |  | 178,700 |  |  | 190,481 |  |  |  |  |
Total Revenue |  | $ | 405,871 |  |  | $ | 293,125 |  |  | $ | 1,052,670 |  |  | $ | 860,445 |  |  |  |  |
|  | Three Months Ended June 30, 2021
|  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 81,521 |  |  | $ | 186,449 |  |  | $ | 37,241 |  |  | $ | 60,444 |  |  | $ | 365,655 |
Time-and-material |  |  | 34,697 |  |  |  | — |  |  |  | 1,876 |  |  |  | 3,643 |  |  |  | 40,216 |
Total revenue |  | $ | 116,218 |  |  | $ | 186,449 |  |  | $ | 39,117 |  |  | $ | 64,087 |  |  | $ | 405,871 |
|  | Three Months Ended June 30, 2020
|  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 79,801 |  |  | $ | 107,905 |  |  | $ | 30,504 |  |  | $ | 53,811 |  |  | $ | 272,021 |
Time-and-material |  |  | 16,699 |  |  |  | — |  |  |  | 1,438 |  |  |  | 2,967 |  |  |  | 21,104 |
Total revenue |  | $ | 96,500 |  |  | $ | 107,905 |  |  | $ | 31,942 |  |  | $ | 56,778 |  |  | $ | 293,125 |
|  | Nine Months Ended June 30, 2021
|  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 226,086 |  |  | $ | 456,276 |  |  | $ | 102,864 |  |  | $ | 170,134 |  |  | $ | 955,360 |
Time-and-material |  |  | 83,374 |  |  |  | — |  |  |  | 5,370 |  |  |  | 8,566 |  |  |  | 97,310 |
Total revenue |  | $ | 309,460 |  |  | $ | 456,276 |  |  | $ | 108,234 |  |  | $ | 178,700 |  |  | $ | 1,052,670 |
|  | Nine Months Ended June 30, 2020
|  |  | Communications |  | Residential |  | Infrastructure Solutions |  | Commercial & Industrial |  | Total
Fixed-price |  | $ | 213,205 |  |  | $ | 300,660 |  |  | $ | 87,479 |  |  | $ | 180,425 |  |  | $ | 781,769 |
Time-and-material |  |  | 63,574 |  |  |  | — |  |  |  | 5,046 |  |  |  | 10,056 |  |  |  | 78,676 |
Total revenue |  | $ | 276,779 |  |  | $ | 300,660 |  |  | $ | 92,525 |  |  | $ | 190,481 |  |  | $ | 860,445 |

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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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