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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Capitalized Contract Cost, Net | $ 59 |  | $ 59 |  |
Unbilled Receivables, Current | 11,545 |  | 11,545 |  |
Estimated profits on contracts in process | 837,980 |  | 837,980 |  | $ 761,401
Billings to Date | (856,388) |  | (856,388) |  | (772,104)
Contract with Customer, Asset, Net, Current | (18,408) |  | (18,408) |  | (10,703)
Costs in Excess of Billings, Current | 27,478 |  | 27,478 |  | 29,860
Billings in Excess of Cost, Current | (45,886) |  | (45,886) |  | $ (40,563)
Contract with Customer, Liability, Revenue Recognized | 21,473 | $ 18,114 | 26,403 | $ 24,701 |
Performance Obligation Next 12 Months | 427,508 |  | 427,508 |  |
Revenue, Remaining Performance Obligation, Amount | 468,694 |  | 468,694 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 291,277 | 256,914 | 567,320 | 500,756 |
Contract with Customer, Liability, Revenue Recognized | 21,473 | 18,114 | 26,403 | 24,701 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 65,960 | 79,975 | 133,703 | 152,558 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 95,990 | 70,437 | 180,279 | 139,762 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 29,300 | 34,450 | 60,583 | 63,929 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 100,027 | 72,052 | 192,755 | 144,507 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 261,667 | 229,218 | 509,748 | 443,844 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 62,779 | 76,467 | 126,614 | 142,297 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 71,377 | 48,602 | 133,404 | 97,431 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 27,484 | 32,097 | 56,975 | 59,609 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 100,027 | 72,052 | 192,755 | 144,507 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 29,610 | 27,696 | 57,572 | 56,912 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 3,181 | 3,508 | 7,089 | 10,261 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 24,613 | 21,835 | 46,875 | 42,331 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,816 | 2,353 | 3,608 | 4,320 |
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 | 10,724 | 12,145 | 21,835 | 24,368 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 18,576 | 22,305 | 38,748 | 39,561 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 58,958 | 51,492 | 113,832 | 101,968 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 41,069 | $ 20,560 | $ 78,923 | $ 42,539 |

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