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Revenue Recognition (Tables) | 12 Months Ended
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Sep. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract] |
Disaggregation of Revenue [Table Text Block] |
| Year Ended September 30,
| 2019 |  | 2018 |  | 2017
Commercial & Industrial | $ | 305,624 |  |  | $ | 274,299 |  |  | $ | 227,606 |
Communications | 321,246 |  |  | 219,655 |  |  | 225,275 |
Infrastructure Solutions |  |  |  |  |
Industrial Services | 48,948 |  |  | 44,701 |  |  | 46,079 |
Custom Power Solutions | 87,842 |  |  | 52,462 |  |  | 37,745 |
Total Infrastructure Solutions | 136,790 |  |  | 97,163 |  |  | 83,824 |
Residential |  |  |  |  |
Single-family | 212,358 |  |  | 190,379 |  |  | 162,100 |
Multi-family and Other | 100,978 |  |  | 95,332 |  |  | 111,939 |
Total Residential | 313,336 |  |  | 285,711 |  |  | 274,039 |
Total Revenue | $ | 1,076,996 |  |  | $ | 876,828 |  |  | $ | 810,744 |
|  | Year Ended September 30, 2019
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 286,319 |  |  | $ | 229,143 |  |  | $ | 129,096 |  |  | $ | 313,336 |  |  | $ | 957,894 |
Time-and-material |  |  | 19,305 |  |  |  | 92,103 |  |  |  | 7,694 |  |  |  | — |  |  |  | 119,102 |
Total revenue |  | $ | 305,624 |  |  | $ | 321,246 |  |  | $ | 136,790 |  |  | $ | 313,336 |  |  | $ | 1,076,996 |
|  | Year Ended September 30, 2018
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 244,464 |  |  | $ | 166,258 |  |  | $ | 90,155 |  |  | $ | 285,711 |  |  | $ | 786,588 |
Time-and-material |  |  | 29,835 |  |  |  | 53,397 |  |  |  | 7,008 |  |  |  | — |  |  |  | 90,240 |
Total revenue |  | $ | 274,299 |  |  | $ | 219,655 |  |  | $ | 97,163 |  |  | $ | 285,711 |  |  | $ | 876,828 |
|  | Year Ended September 30, 2017
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 206,850 |  |  | $ | 174,922 |  |  | $ | 76,232 |  |  | $ | 274,039 |  |  | $ | 732,043 |
Time-and-material |  |  | 20,756 |  |  |  | 50,353 |  |  |  | 7,592 |  |  |  | — |  |  |  | 78,701 |
Total revenue |  | $ | 227,606 |  |  | $ | 225,275 |  |  | $ | 83,824 |  |  | $ | 274,039 |  |  | $ | 810,744 |
Contract with Customer, Asset and Liability [Table Text Block] | The net asset (liability) position for contracts in process consisted of the following:
|  | September 30,
|  | 2019 |  | 2018
Costs and estimated earnings on uncompleted contracts |  | $ | 761,401 |  |  | $ | 539,226 |
Less: Billings to date and unbilled accounts receivable |  |  | (772,104 | ) |  |  | (541,606 | )
|  | $ | (10,703 | ) |  | $ | (2,380 | )
The net asset (liability) position for contracts in process included in the accompanying consolidated balance sheets was as follows:
|  | September 30,
|  | 2019 |  | 2018
Costs and estimated earnings in excess of billings |  | $ | 29,860 |  |  | $ | 31,446 |
Billings in excess of costs and estimated earnings |  |  | (40,563 | ) |  |  | (33,826 | )
|  | $ | (10,703 | ) |  | $ | (2,380 | )

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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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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