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Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract] |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, |  | Nine Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Commercial & Industrial |  | $ | 75,370 |  |  | $ | 78,156 |  |  | $ | 227,928 |  |  | $ | 196,747 |
Communications |  | 90,438 |  |  | 54,368 |  |  | 230,200 |  |  | 159,071 |
Infrastructure Solutions |  |  |  |  |  |  |  |
Industrial Services |  | 12,339 |  |  | 11,417 |  |  | 36,707 |  |  | 32,874 |
Custom Power Solutions |  | 23,770 |  |  | 13,439 |  |  | 63,331 |  |  | 37,533 |
Total |  | 36,109 |  |  | 24,856 |  |  | 100,038 |  |  | 70,407 |
Residential |  |  |  |  |  |  |  |
Single-family |  | 54,200 |  |  | 51,028 |  |  | 156,168 |  |  | 139,235 |
Multi-family and Other |  | 26,516 |  |  | 24,168 |  |  | 69,055 |  |  | 71,093 |
Total |  | 80,716 |  |  | 75,196 |  |  | 225,223 |  |  | 210,328 |
Total Revenue |  | $ | 282,633 |  |  | $ | 232,576 |  |  | $ | 783,389 |  |  | $ | 636,553 |
|  | Three Months Ended June 30, 2019
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 70,917 |  |  | $ | 65,219 |  |  | $ | 29,925 |  |  | $ | 80,716 |  |  | $ | 246,777 |
Time-and-material |  |  | 4,453 |  |  |  | 25,219 |  |  |  | 6,184 |  |  |  | — |  |  |  | 35,856 |
Total revenue |  | $ | 75,370 |  |  | $ | 90,438 |  |  | $ | 36,109 |  |  | $ | 80,716 |  |  | $ | 282,633 |
|  | Three Months Ended June 30, 2018
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 68,762 |  |  | $ | 42,927 |  |  | $ | 19,865 |  |  | $ | 75,196 |  |  | $ | 206,750 |
Time-and-material |  |  | 9,394 |  |  |  | 11,441 |  |  |  | 4,991 |  |  |  | — |  |  |  | 25,826 |
Total revenue |  | $ | 78,156 |  |  | $ | 54,368 |  |  | $ | 24,856 |  |  | $ | 75,196 |  |  | $ | 232,576 |
|  | Nine Months Ended June 30, 2019
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 213,214 |  |  | $ | 162,650 |  |  | $ | 87,566 |  |  | $ | 225,223 |  |  | $ | 688,653 |
Time-and-material |  |  | 14,714 |  |  |  | 67,550 |  |  |  | 12,472 |  |  |  | — |  |  |  | 94,736 |
Total revenue |  | $ | 227,928 |  |  | $ | 230,200 |  |  | $ | 100,038 |  |  | $ | 225,223 |  |  | $ | 783,389 |
|  | Nine Months Ended June 30, 2018
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 175,866 |  |  | $ | 124,428 |  |  | $ | 60,172 |  |  | $ | 210,328 |  |  | $ | 570,794 |
Time-and-material |  |  | 20,881 |  |  |  | 34,643 |  |  |  | 10,235 |  |  |  | — |  |  |  | 65,759 |
Total revenue |  | $ | 196,747 |  |  | $ | 159,071 |  |  | $ | 70,407 |  |  | $ | 210,328 |  |  | $ | 636,553 |
Contract with Customer, Asset and Liability [Table Text Block] | The net asset (liability) position for contracts in process consisted of the following:
|  | June 30, |  | September 30,
|  | 2019 |  | 2018
Costs and estimated earnings on uncompleted contracts |  | $ | 720,469 |  |  | $ | 539,226 |
Less: Billings to date and unbilled accounts receivable |  |  | (721,521 | ) |  |  | (541,606 | )
|  | $ | (1,052 | ) |  | $ | (2,380 | )
The net asset (liability) position for contracts in process included in the accompanying consolidated balance sheets was as follows:
|  | June 30, |  | September 30,
|  | 2019 |  | 2018
Costs and estimated earnings in excess of billings |  | $ | 34,807 |  |  | $ | 31,446 |
Billings in excess of costs and estimated earnings |  |  | (35,859 | ) |  |  | (33,826 | )
|  | $ | (1,052 | ) |  | $ | (2,380 | )

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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