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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024
Revenue Recognition and Deferred Revenue [Abstract] |  |  |
Unbilled Receivables, Current | $ 14,467 |  |
Costs and estimated earnings in excess of billings | 59,630 |  | $ 60,139
Billings in excess of costs and estimated earnings | (170,393) |  | $ (158,972)
Contract with Customer, Liability, Revenue Recognized | 116,848 | $ 77,964 |
Performance Obligation Next 12 Months | 994,694 |  |
Revenue, Remaining Performance Obligation, Amount | 1,214,828 |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 749,547 | 634,444 |
Contract with Customer, Liability, Revenue Recognized | 116,848 | 77,964 |
Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 88,491 | 84,952 |
Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 232,960 | 170,748 |
Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 108,125 | 62,888 |
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 319,971 | 315,856 |
Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 662,694 | 575,869 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 76,190 | 73,910 |
Fixed-price Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 166,333 | 125,223 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 100,200 | 60,880 |
Fixed-price Contract [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 319,971 | 315,856 |
Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 86,853 | 58,575 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 12,301 | 11,042 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 66,627 | 45,525 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,925 | 2,008 |
Time-and-materials Contract [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 |
industrial Services [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 18,668 | 11,098 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 89,457 | 51,790 |
Single Family Contracts [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169,217 | 173,984 |
Multi Family and Other [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 76,571 | 69,289 |
Single Family Contracts Plumbing HVAC | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 74,183 | $ 72,583 |

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