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Revenue Recognition (Tables) | 3 Months Ended
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Dec. 31, 2019
Revenue Recognition and Deferred Revenue [Abstract] |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31,
|  | 2019 |  | 2018
Commercial & Industrial |  | $ | 67,743 |  |  | $ | 72,583 |
Communications |  | 84,289 |  |  | 69,325 |
Infrastructure Solutions |  |  |  |
Industrial Services |  | 11,111 |  |  | 12,223 |
Custom Power Solutions |  | 20,172 |  |  | 17,256 |
Total |  | 31,283 |  |  | 29,479 |
Residential |  |  |  |
Single-family |  | 54,874 |  |  | 50,476 |
Multi-family and Other |  | 37,854 |  |  | 21,979 |
Total |  | 92,728 |  |  | 72,455 |
Total Revenue |  | $ | 276,043 |  |  | $ | 243,842 |
|  | Three Months Ended December 31, 2019
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 63,835 |  |  | $ | 62,027 |  |  | $ | 29,491 |  |  | $ | 92,728 |  |  | $ | 248,081 |
Time-and-material |  |  | 3,908 |  |  |  | 22,262 |  |  |  | 1,792 |  |  |  | — |  |  |  | 27,962 |
Total revenue |  | $ | 67,743 |  |  | $ | 84,289 |  |  | $ | 31,283 |  |  | $ | 92,728 |  |  | $ | 276,043 |
|  | Three Months Ended December 31, 2018
|  |  | Commercial & Industrial |  | Communications |  | Infrastructure Solutions |  | Residential |  | Total
Fixed-price |  | $ | 65,830 |  |  | $ | 48,829 |  |  | $ | 27,511 |  |  | $ | 72,455 |  |  | $ | 214,625 |
Time-and-material |  |  | 6,753 |  |  |  | 20,496 |  |  |  | 1,968 |  |  |  | — |  |  |  | 29,217 |
Total revenue |  | $ | 72,583 |  |  | $ | 69,325 |  |  | $ | 29,479 |  |  | $ | 72,455 |  |  | $ | 243,842 |
Contract with Customer, Asset and Liability [Table Text Block] | The net asset (liability) position for contracts in process consisted of the following:
|  | December 31, |  | September 30,
|  | 2019 |  | 2019
Costs and estimated earnings on uncompleted contracts |  | $ | 750,341 |  |  | $ | 761,401 |
Less: Billings to date and unbilled accounts receivable |  |  | (767,955 | ) |  |  | (772,104 | )
|  | $ | (17,614 | ) |  | $ | (10,703 | )
The net asset (liability) position for contracts in process included in the accompanying consolidated balance sheets was as follows:
|  | December 31, |  | September 30,
|  | 2019 |  | 2019
Costs and estimated earnings in excess of billings |  | $ | 27,941 |  |  | $ | 29,860 |
Billings in excess of costs and estimated earnings |  |  | (45,555 | ) |  |  | (40,563 | )
|  | $ | (17,614 | ) |  | $ | (10,703 | )

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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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