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Revenue Recognition (Tables) | 6 Months Ended
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Mar. 31, 2019
Revenue Recognition [Abstract] |
Disaggregation Of Revenue [Table Text Block] |
|  | Three Months Ended March 31, |  | Six Months Ended March 31,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Commercial & Industrial |  | $ | 79,975 |  |  | 65,589 |  |  | 152,558 |  |  | 118,591
Communications |  |  | 70,437 |  |  | 50,244 |  |  | 139,762 |  |  | 104,703
Infrastructure Solutions |  |  |  |  |  |  |  |  |  |  |  |
Industrial Services |  |  | 12,145 |  |  | 10,404 |  |  | 24,368 |  |  | 21,457
Custom Power Solutions |  |  | 22,305 |  |  | 13,462 |  |  | 39,561 |  |  | 24,094
Total |  |  | 34,450 |  |  | 23,866 |  |  | 63,929 |  |  | 45,551
Residential |  |  |  |  |  |  |  |  |  |  |  |
Single-family |  |  | 51,492 |  |  | 43,594 |  |  | 101,968 |  |  | 88,208
Multi-family and Other |  |  | 20,560 |  |  | 22,384 |  |  | 42,539 |  |  | 46,924
Total |  |  | 72,052 |  |  | 65,978 |  |  | 144,507 |  |  | 135,132
Total Revenue |  | $ | 256,914 |  | $ | 205,677 |  | $ | 500,756 |  | $ | 403,977
|  | Three Months Ended March 31, 2019
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Total
Fixed-price |  | $ | 76,467 |  | $ | 48,602 |  | $ | 30,130 |  | $ | 72,052 |  | $ | 227,251
Time-and-material |  |  | 3,508 |  |  | 21,835 |  |  | 4,320 |  |  | - |  |  | 29,663
Total revenue |  | $ | 79,975 |  | $ | 70,437 |  | $ | 34,450 |  | $ | 72,052 |  | $ | 256,914
|  | Three Months Ended March 31, 2018
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Total
Fixed-price |  | $ | 58,183 |  | $ | 37,344 |  | $ | 20,636 |  | $ | 65,978 |  | $ | 182,141
Time-and-material |  |  | 7,406 |  |  | 12,900 |  |  | 3,230 |  |  | - |  |  | 23,536
Total revenue |  | $ | 65,589 |  | $ | 50,244 |  | $ | 23,866 |  | $ | 65,978 |  | $ | 205,677
|  | Six Months Ended March 31, 2019
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Total
Fixed-price |  | $ | 142,297 |  | $ | 97,431 |  | $ | 57,641 |  | $ | 144,507 |  | $ | 441,876
Time-and-material |  |  | 10,261 |  |  | 42,331 |  |  | 6,288 |  |  | - |  |  | 58,880
Total revenue |  | $ | 152,558 |  | $ | 139,762 |  | $ | 63,929 |  | $ | 144,507 |  | $ | 500,756
|  | Six Months Ended March 31, 2018
|  |  | Commercial & |  |  |  |  | Infrastructure |  |  |  |  |
|  |  | Industrial |  | Communications |  | Solutions |  | Residential |  | Total
Fixed-price |  | $ | 107,103 |  | $ | 81,500 |  | $ | 40,309 |  | $ | 135,132 |  | $ | 364,044
Time-and-material |  |  | 11,488 |  |  | 23,203 |  |  | 5,242 |  |  | - |  |  | 39,933
Total revenue |  | $ | 118,591 |  | $ | 104,703 |  | $ | 45,551 |  | $ | 135,132 |  | $ | 403,977
Contract With Customer Asset And Liability [Table Text Block] |
|  | March 31, |  | September 30,
|  | 2019 |  | 2018
Costs and estimated earnings on uncompleted contracts |  | $ | 586,289 |  | $ | 539,226
Less: Billings to date and unbilled accounts receivable |  |  | (590,928) |  |  | (541,606)
|  | $ | (4,639) |  | $ | (2,380)
|  | March 31, |  | September 30,
|  | 2019 |  | 2018
Costs and estimated earnings in excess of billings |  | $ | 28,293 |  | $ | 31,446
Billings in excess of costs and estimated earnings |  |  | (32,932) |  |  | (33,826)
|  | $ | (4,639) |  | $ | (2,380)

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