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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Unbilled Receivables, Current | $ 7,385 |  | $ 7,385 |  |
Costs and estimated earnings in excess of billings | 48,284 |  | 48,284 |  | $ 48,620
Billings in excess of costs and estimated earnings | (127,767) |  | (127,767) |  | $ (103,771)
Contract with Customer, Liability, Revenue Recognized |  |  | 92,970 | $ 52,350 |
Performance Obligation Next 12 Months | 875,040 |  | 875,040 |  |
Revenue, Remaining Performance Obligation, Amount | 1,065,444 |  | 1,065,444 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 705,733 | $ 568,881 | 1,340,177 | 1,143,755 |
Contract with Customer, Liability, Revenue Recognized |  |  | 92,970 | 52,350 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 97,069 | 69,033 | 182,021 | 129,300 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 193,503 | 141,120 | 364,251 | 288,365 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 75,789 | 52,616 | 138,677 | 101,900 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 339,372 | 306,112 | 655,228 | 624,190 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 637,031 | 509,370 | 1,212,900 | 1,014,163 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 82,972 | 59,915 | 156,882 | 111,810 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 141,144 | 92,392 | 266,367 | 179,666 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 73,543 | 50,951 | 134,423 | 98,497 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 339,372 | 306,112 | 655,228 | 624,190 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 68,702 | 59,511 | 127,277 | 129,592 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 14,097 | 9,118 | 25,139 | 17,490 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 52,359 | 48,728 | 97,884 | 108,699 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 2,246 | 1,665 | 4,254 | 3,403 |
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 | 12,076 | 11,562 | 23,174 | 22,516 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 63,713 | 41,054 | 115,503 | 79,384 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 252,292 | 227,216 | 498,859 | 470,925 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 87,080 | $ 78,896 | $ 156,369 | $ 153,265 |

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