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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Capitalized Contract Cost, Net | $ 86 |  |  |  |  |  |  |  | $ 86 |  |
Unbilled Receivables, Current | 11,329 |  |  |  |  |  |  |  | 11,329 |  |
Estimated profits on contracts in process | 761,401 |  |  |  | $ 539,226 |  |  |  | 761,401 | $ 539,226 |
Billings to Date | (772,104) |  |  |  | (541,606) |  |  |  | (772,104) | (541,606) |
Contract with Customer, Asset, Net, Current | (10,703) |  |  |  | (2,380) |  |  |  | (10,703) | (2,380) |
Costs in Excess of Billings, Current | 29,860 |  |  |  | 31,446 |  |  |  | 29,860 | 31,446 |
Billings in Excess of Cost, Current | (40,563) |  |  |  | (33,826) |  |  |  | (40,563) | (33,826) |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  | 31,831 | 31,135 |
Revenue, Remaining Performance Obligation, Amount | 451,884 |  |  |  |  |  |  |  | 451,884 |  |
Performance Obligation Next 12 Months | 391,769 |  |  |  |  |  |  |  | 391,769 |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 293,607 | $ 282,633 | $ 256,914 | $ 243,842 | $ 240,275 | $ 232,576 | $ 205,677 | $ 198,300 | 1,076,996 | 876,828 | $ 810,744
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 305,624 | 274,299 | 227,606
Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 321,246 | 219,655 | 225,275
Infrastructure Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 136,790 | 97,163 | 83,824
Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 313,336 | 285,711 | 274,039
Fixed-price Contract [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 957,894 | 786,588 | 732,043
Fixed-price Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 286,319 | 244,464 | 206,850
Fixed-price Contract [Member] | Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 229,143 | 166,258 | 174,922
Fixed-price Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 129,096 | 90,155 | 76,232
Fixed-price Contract [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 313,336 | 285,711 | 274,039
Time-and-materials Contract [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 119,102 | 90,240 | 78,701
Time-and-materials Contract [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 19,305 | 29,835 | 20,756
Time-and-materials Contract [Member] | Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 92,103 | 53,397 | 50,353
Time-and-materials Contract [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,694 | 7,008 | 7,592
Time-and-materials Contract [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
industrial Services [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 48,948 | 44,701 | 46,079
Custom Power Solutions [Member] | Infrastructure Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 87,842 | 52,462 | 37,745
Single Family Contracts [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 212,358 | 190,379 | 162,100
Multi Family and Other [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 100,978 | $ 95,332 | $ 111,939

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