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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract] |  |  |
Unbilled Receivables, Current | $ 20,767 |  |
Costs and estimated earnings in excess of billings | 52,529 |  | $ 43,389
Billings in excess of costs and estimated earnings | (66,242) |  | $ (62,486)
Contract with Customer, Liability, Revenue Recognized | 28,341 | $ 25,225 |
Performance Obligation Next 12 Months | 653,218 |  |
Revenue, Remaining Performance Obligation, Amount | 721,126 |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 480,509 | 314,838 |
Contract with Customer, Liability, Revenue Recognized | 28,341 | 25,225 |
Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 69,248 | 62,590 |
Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 127,389 | 98,356 |
Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 42,096 | 34,401 |
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 241,776 | 119,491 |
Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 435,511 | 288,856 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 64,860 | 60,687 |
Fixed-price Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 88,422 | 76,014 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 40,453 | 32,664 |
Fixed-price Contract [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 241,776 | 119,491 |
Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 44,998 | 25,982 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,388 | 1,903 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 38,967 | 22,342 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,643 | 1,737 |
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 | 14,816 | 10,040 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 27,280 | 24,361 |
Single Family Contracts [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 173,528 | 72,126 |
Multi Family and Other [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 68,248 | $ 47,365 |

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