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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |
Capitalized Contract Cost, Net | $ 96 |  | $ 96 |  |
Unbilled Receivables, Current | 10,617 |  | 10,617 |  |
Estimated profits on contracts in process | 720,469 |  | 720,469 |  | $ 539,226
Billings to Date | (721,521) |  | (721,521) |  | (541,606)
Contract with Customer, Asset, Net, Current | (1,052) |  | (1,052) |  | (2,380)
Costs in Excess of Billings, Current | 34,807 |  | 34,807 |  | 31,446
Billings in Excess of Cost, Current | (35,859) |  | (35,859) |  | $ (33,826)
Contract with Customer, Liability, Revenue Recognized | 18,472 | $ 15,076 | 28,816 | $ 28,627 |
Performance Obligation Next 12 Months | 387 |  | 387 |  |
Revenue, Remaining Performance Obligation, Amount | 487 |  | 487 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 282,633 | 232,576 | 783,389 | 636,553 |
Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 75,370 | 78,156 | 227,928 | 196,747 |
Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 90,438 | 54,368 | 230,200 | 159,071 |
Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 36,109 | 24,856 | 100,038 | 70,407 |
Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 80,716 | 75,196 | 225,223 | 210,328 |
Fixed-price Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 246,777 | 206,750 | 688,653 | 570,794 |
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 70,917 | 68,762 | 213,214 | 175,866 |
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 65,219 | 42,927 | 162,650 | 124,428 |
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 29,925 | 19,865 | 87,566 | 60,172 |
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 80,716 | 75,196 | 225,223 | 210,328 |
Time-and-materials Contract [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 35,856 | 25,826 | 94,736 | 65,759 |
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 4,453 | 9,394 | 14,714 | 20,881 |
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 25,219 | 11,441 | 67,550 | 34,643 |
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 6,184 | 4,991 | 12,472 | 10,235 |
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 | 12,339 | 11,417 | 36,707 | 32,874 |
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 23,770 | 13,439 | 63,331 | 37,533 |
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 54,200 | 51,028 | 156,168 | 139,235 |
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 26,516 | $ 24,168 | $ 69,055 | $ 71,093 |

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