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v3.25.1

Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Unbilled Receivables, Current | $ 18,758 |  | $ 18,758 |  |
Costs and estimated earnings in excess of billings | 87,416 |  | 87,416 |  | $ 60,139
Billings in excess of costs and estimated earnings | (163,605) |  | (163,605) |  | $ (158,972)
Contract with Customer, Liability, Revenue Recognized |  |  | 140,390 | $ 92,970 |
Performance Obligation Next 12 Months | 1,067,317 |  | 1,067,317 |  |
Revenue, Remaining Performance Obligation, Amount | 1,225,985 |  | 1,225,985 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 833,960 | $ 705,733 | 1,583,507 | 1,340,177 |
Contract with Customer, Liability, Revenue Recognized |  |  | 140,390 | 92,970 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 125,358 | 97,069 | 213,849 | 182,021 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 273,016 | 193,503 | 505,976 | 364,251 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 117,620 | 75,789 | 225,745 | 138,677 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 317,966 | 339,372 | 637,937 | 655,228 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 734,371 | 637,031 | 1,397,065 | 1,212,900 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 107,516 | 82,972 | 183,706 | 156,882 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 202,412 | 141,144 | 368,745 | 266,367 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 106,477 | 73,543 | 206,677 | 134,423 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 317,966 | 339,372 | 637,937 | 655,228 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 99,589 | 68,702 | 186,442 | 127,277 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 17,842 | 14,097 | 30,143 | 25,139 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 70,604 | 52,359 | 137,231 | 97,884 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 11,143 | 2,246 | 19,068 | 4,254 |
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 | 29,178 | 12,076 | 47,846 | 23,174 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 88,442 | 63,713 | 177,899 | 115,503 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 160,065 | 170,606 | 329,282 | 344,587 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 78,733 | 87,080 | 155,304 | 156,369 |
Single Family Contracts Plumbing HVAC | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 79,168 | $ 81,686 | $ 153,351 | $ 154,272 |

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