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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Revenue Recognition and Deferred Revenue [Abstract] |  |  |
Unbilled Receivables, Current | $ 15,135 |  |
Costs and estimated earnings in excess of billings | 44,515 |  | $ 52,076
Billings in excess of costs and estimated earnings | (95,442) |  | $ (84,936)
Contract with Customer, Liability, Revenue Recognized | 38,047 | $ 28,341 |
Performance Obligation Next 12 Months | 921,848 |  |
Revenue, Remaining Performance Obligation, Amount | 1,011,018 |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 574,874 | 480,509 |
Contract with Customer, Liability, Revenue Recognized | 38,047 | 28,341 |
Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 60,267 | 69,248 |
Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 147,245 | 127,389 |
Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 49,284 | 42,096 |
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 318,078 | 241,776 |
Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 507,495 | 435,511 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 54,597 | 64,860 |
Fixed-price Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 87,274 | 88,422 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 47,546 | 40,453 |
Fixed-price Contract [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 318,078 | 241,776 |
Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 67,379 | 44,998 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,670 | 4,388 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 59,971 | 38,967 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,738 | 1,643 |
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 | 20,099 | 14,816 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 29,185 | 27,280 |
Single Family Contracts [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 226,828 | 173,528 |
Multi Family and Other [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 91,250 | $ 68,248 |

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