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Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2020
Revenue Recognition and Deferred Revenue [Abstract] |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, |  |  |  | Nine Months Ended June 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Commercial & Industrial |  | $ | 56,778 |  |  | $ | 75,370 |  |  | $ | 190,481 |  |  | $ | 227,928 |
Communications |  | 96,500 |  |  | 90,438 |  |  | 276,779 |  |  | 230,200 |
Infrastructure Solutions |  |  |  |  |  |  |  |
Industrial Services |  | 9,753 |  |  | 12,339 |  |  | 31,588 |  |  | 36,707 |
Custom Power Solutions |  | 22,189 |  |  | 23,770 |  |  | 60,937 |  |  | 63,331 |
Total Infrastructure Solutions |  | 31,942 |  |  | 36,109 |  |  | 92,525 |  |  | 100,038 |
Residential |  |  |  |  |  |  |  |
Single-family |  | 62,239 |  |  | 54,200 |  |  | 176,071 |  |  | 156,168 |
Multi-family and Other |  | 45,666 |  |  | 26,516 |  |  | 124,589 |  |  | 69,055 |
Total Residential |  | 107,905 |  |  | 80,716 |  |  | 300,660 |  |  | 225,223 |
Total Revenue |  | $ | 293,125 |  |  | $ | 282,633 |  |  | $ | 860,445 |  |  | $ | 783,389 |
|  | Three Months Ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Commercial & Industrial |  |  | Communications |  |  | Infrastructure Solutions |  |  | Residential |  |  | Total |
Fixed-price |  |  | $ | 53,811 |  |  | $ | 79,801 |  |  | $ | 30,504 |  |  | $ | 107,905 |  |  | $ | 272,021 |
Time-and-material |  |  |  | 2,967 |  |  |  | 16,699 |  |  |  | 1,438 |  |  |  | — |  |  |  | 21,104 |
Total revenue |  |  | $ | 56,778 |  |  | $ | 96,500 |  |  | $ | 31,942 |  |  | $ | 107,905 |  |  | $ | 293,125 |
|  | Three Months Ended June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Commercial & Industrial |  |  | Communications |  |  | Infrastructure Solutions |  |  | Residential |  |  | Total |
Fixed-price |  |  | $ | 70,917 |  |  | $ | 65,219 |  |  | $ | 34,244 |  |  | $ | 80,716 |  |  | $ | 251,096 |
Time-and-material |  |  |  | 4,453 |  |  |  | 25,219 |  |  |  | 1,865 |  |  |  | — |  |  |  | 31,537 |
Total revenue |  |  | $ | 75,370 |  |  | $ | 90,438 |  |  | $ | 36,109 |  |  | $ | 80,716 |  |  | $ | 282,633 |
|  | Nine Months Ended June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Commercial & Industrial |  |  | Communications |  |  | Infrastructure Solutions |  |  | Residential |  |  | Total |
Fixed-price |  |  | $ | 180,425 |  |  | $ | 213,205 |  |  | $ | 87,479 |  |  | $ | 300,660 |  |  | $ | 781,769 |
Time-and-material |  |  |  | 10,056 |  |  |  | 63,574 |  |  |  | 5,046 |  |  |  | — |  |  |  | 78,676 |
Total revenue |  |  | $ | 190,481 |  |  | $ | 276,779 |  |  | $ | 92,525 |  |  | $ | 300,660 |  |  | $ | 860,445 |
|  | Nine Months Ended June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Commercial & Industrial |  |  | Communications |  |  | Infrastructure Solutions |  |  | Residential |  |  | Total |
Fixed-price |  |  | $ | 213,214 |  |  | $ | 162,650 |  |  | $ | 93,853 |  |  | $ | 225,223 |  |  | $ | 694,940 |
Time-and-material |  |  |  | 14,714 |  |  |  | 67,550 |  |  |  | 6,185 |  |  |  | — |  |  |  | 88,449 |
Total revenue |  |  | $ | 227,928 |  |  | $ | 230,200 |  |  | $ | 100,038 |  |  | $ | 225,223 |  |  | $ | 783,389 |
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, |
|  | 2020 |  |  | 2019 |
Costs and estimated earnings on uncompleted contracts |  | $ | 868,267 |  |  | $ | 761,401 |
Less: Billings to date and unbilled accounts receivable |  |  | (898,620) |  |  |  | (772,104) |
|  | $ | (30,353) |  |  | $ | (10,703) |
The net asset (liability) position for contracts in process included in the accompanying consolidated balance sheets was as follows:
|  | June 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |
Costs and estimated earnings in excess of billings |  | $ | 25,821 |  |  | $ | 29,860 |
Billings in excess of costs and estimated earnings |  |  | (56,174) |  |  |  | (40,563) |
|  | $ | (30,353) |  |  | $ | (10,703) |

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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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