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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Unbilled Receivables, Current | $ 17,651 |  | $ 17,651 |  |
Costs and estimated earnings in excess of billings | 58,728 |  | 58,728 |  | $ 43,389
Billings in excess of costs and estimated earnings | (71,397) |  | (71,397) |  | $ (62,486)
Contract with Customer, Liability, Revenue Recognized | 30,204 | $ 25,851 | 46,703 | $ 41,121 |
Performance Obligation Next 12 Months | 852,181 |  | 852,181 |  |
Revenue, Remaining Performance Obligation, Amount | 893,923 |  | 893,923 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 567,301 | 405,871 | 1,549,403 | 1,052,670 |
Contract with Customer, Liability, Revenue Recognized | 30,204 | 25,851 | 46,703 | 41,121 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 80,953 | 64,087 | 219,016 | 178,700 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 144,748 | 116,218 | 402,776 | 309,460 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 39,837 | 39,117 | 123,666 | 108,234 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 301,763 | 186,449 | 803,945 | 456,276 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 509,777 | 365,655 | 1,395,686 | 955,360 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 75,779 | 60,444 | 204,985 | 170,134 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 94,109 | 81,521 | 268,253 | 226,086 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 38,126 | 37,241 | 118,503 | 102,864 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 301,763 | 186,449 | 803,945 | 456,276 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 57,524 | 40,216 | 153,717 | 97,310 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 5,174 | 3,643 | 14,031 | 8,566 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 50,639 | 34,697 | 134,523 | 83,374 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,711 | 1,876 | 5,163 | 5,370 |
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 | 15,317 | 11,972 | 45,970 | 32,560 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 24,520 | 27,145 | 77,696 | 75,674 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 224,556 | 102,105 | 590,453 | 274,707 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 77,207 | $ 84,344 | $ 213,492 | $ 181,569 |

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