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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract] |  |  |
Capitalized Contract Cost, Net | $ 64 |  |
Unbilled Receivables, Current | 11,369 |  |
Estimated profits on contracts in process | 750,341 |  | $ 761,401
Billings to Date | (767,955) |  | (772,104)
Contract with Customer, Asset, Net, Current | (17,614) |  | (10,703)
Costs in Excess of Billings, Current | 27,941 |  | 29,860
Billings in Excess of Cost, Current | (45,555) |  | $ (40,563)
Contract with Customer, Liability, Revenue Recognized | 19,550 | $ 20,167 |
Performance Obligation Next 12 Months | 379,950 |  |
Revenue, Remaining Performance Obligation, Amount | 430,072 |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 276,043 | 243,842 |
Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 67,743 | 72,583 |
Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 84,289 | 69,325 |
Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 31,283 | 29,479 |
Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 92,728 | 72,455 |
Fixed-price Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 248,081 | 214,625 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 63,835 | 65,830 |
Fixed-price Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 62,027 | 48,829 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 29,491 | 27,511 |
Fixed-price Contract [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 92,728 | 72,455 |
Time-and-materials Contract [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 27,962 | 29,217 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,908 | 6,753 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 22,262 | 20,496 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,792 | 1,968 |
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 | 11,111 | 12,223 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 20,172 | 17,256 |
Single Family Contracts [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 54,874 | 50,476 |
Multi Family and Other [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 37,854 | $ 21,979 |

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