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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Capitalized Contract Cost, Net | $ 100 |  | $ 100 |  |
Unbilled Receivables, Current | 18,525 |  | 18,525 |  |
Costs and estimated earnings in excess of billings | 31,962 |  | 31,962 |  | $ 29,937
Billings in excess of costs and estimated earnings | (67,235) |  | (67,235) |  | $ (55,739)
Contract with Customer, Liability, Revenue Recognized | 25,851 | $ 19,661 | 41,121 | $ 29,692 |
Performance Obligation Next 12 Months | 555,454 |  | 555,454 |  |
Revenue, Remaining Performance Obligation, Amount | 668,716 |  | 668,716 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 405,871 | 293,125 | 1,052,670 | 860,445 |
Contract with Customer, Liability, Revenue Recognized | 25,851 | 19,661 | 41,121 | 29,692 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 64,087 | 56,778 | 178,700 | 190,481 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 116,218 | 96,500 | 309,460 | 276,779 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 39,117 | 31,942 | 108,234 | 92,525 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 186,449 | 107,905 | 456,276 | 300,660 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 365,655 | 272,021 | 955,360 | 781,769 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 60,444 | 53,811 | 170,134 | 180,425 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 81,521 | 79,801 | 226,086 | 213,205 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 37,241 | 30,504 | 102,864 | 87,479 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 186,449 | 107,905 | 456,276 | 300,660 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 40,216 | 21,104 | 97,310 | 78,676 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 3,643 | 2,967 | 8,566 | 10,056 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 34,697 | 16,699 | 83,374 | 63,574 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,876 | 1,438 | 5,370 | 5,046 |
Time-and-materials Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 0 | 0 | 0 | 0 |
industrial Services [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 11,972 | 9,753 | 32,560 | 31,588 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 27,145 | 22,189 | 75,674 | 60,937 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 102,105 | 62,239 | 274,707 | 176,071 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 84,344 | $ 45,666 | $ 181,569 | $ 124,589 |

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