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Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 206,581 | $ 208,323 | $ 203,662 | $ 192,178 | $ 205,647 | $ 179,599 | $ 159,981 | $ 150,766 | $ 810,744 | $ 695,993 | $ 573,857
Cost of Services |  |  |  |  |  |  |  |  | 670,246 | 569,013 | 473,966
Gross Profit | 38,104 | $ 35,398 | $ 31,814 | $ 35,182 | 37,538 | $ 33,997 | $ 27,812 | $ 27,633 | 140,498 | 126,980 | 99,891
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 120,370 | 100,558 | 81,416
Contingent Consideration |  |  |  |  |  |  |  |  | (145) | 652 | 0
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | (69) | 810 | (13)
Operating Income (Loss) |  |  |  |  |  |  |  |  | 20,342 | 24,960 | 18,488
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,634 | 5,664 | 2,509
Capital Expenditures |  |  |  |  |  |  |  |  | 4,589 | 3,417 | 2,779
Assets | 424,494 |  |  |  | 394,340 |  |  |  | 424,494 | 394,340 | 225,679
Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 227,606 | 222,466 | 178,865
Cost of Services |  |  |  |  |  |  |  |  | 208,619 | 197,679 | 157,322
Gross Profit |  |  |  |  |  |  |  |  | 18,987 | 24,787 | 21,543
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 20,170 | 17,169 | 15,027
Contingent Consideration |  |  |  |  |  |  |  |  | 0 | 0 |
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | (32) | (17) | (11)
Operating Income (Loss) |  |  |  |  |  |  |  |  | (1,151) | 7,635 | 6,527
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,648 | 1,234 | 283
Capital Expenditures |  |  |  |  |  |  |  |  | 1,241 | 795 | 391
Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 225,275 | 189,635 | 141,858
Cost of Services |  |  |  |  |  |  |  |  | 187,419 | 157,104 | 116,015
Gross Profit |  |  |  |  |  |  |  |  | 37,856 | 32,531 | 25,843
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 24,219 | 20,839 | 15,735
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | (1) | 0 | (18)
Operating Income (Loss) |  |  |  |  |  |  |  |  | 13,638 | 11,692 | 10,126
Depreciation and amortization |  |  |  |  |  |  |  |  | 740 | 577 | 512
Capital Expenditures |  |  |  |  |  |  |  |  | 2,046 | 1,102 | 675
Assets | 63,917 |  |  |  | 68,018 |  |  |  | 63,917 | 68,018 | 49,500
Infrastructure Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 83,824 | 58,003 | 46,827
Cost of Services |  |  |  |  |  |  |  |  | 63,399 | 42,356 | 36,194
Gross Profit |  |  |  |  |  |  |  |  | 20,425 | 15,647 | 10,633
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 17,859 | 12,404 | 9,498
Contingent Consideration |  |  |  |  |  |  |  |  | (145) | 652 |
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | (79) | 826 | 12
Operating Income (Loss) |  |  |  |  |  |  |  |  | 2,790 | 1,765 | 1,123
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,412 | 509 | 952
Capital Expenditures |  |  |  |  |  |  |  |  | 538 | 704 | 1,197
Assets | 106,114 |  |  |  | 89,447 |  |  |  | 106,114 | 89,447 | 30,112
Residential |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 274,039 | 225,889 | 206,307
Cost of Services |  |  |  |  |  |  |  |  | 210,809 | 171,874 | 164,435
Gross Profit |  |  |  |  |  |  |  |  | 63,230 | 54,015 | 41,872
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 43,689 | 37,585 | 31,877
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 43 | 1 | 4
Operating Income (Loss) |  |  |  |  |  |  |  |  | 19,498 | 16,429 | 9,991
Depreciation and amortization |  |  |  |  |  |  |  |  | 565 | 272 | 485
Capital Expenditures |  |  |  |  |  |  |  |  | 561 | 95 | 352
Assets | 51,994 |  |  |  | 43,195 |  |  |  | 51,994 | 43,195 | 37,755
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of Services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross Profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  | 14,433 | 12,561 | 9,279
Loss (gain) on sale of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income (Loss) |  |  |  |  |  |  |  |  | (14,433) | (12,561) | (9,279)
Depreciation and amortization |  |  |  |  |  |  |  |  | 269 | 272 | 277
Capital Expenditures |  |  |  |  |  |  |  |  | 203 | 95 | 164
Assets | $ 117,712 |  |  |  | $ 133,917 |  |  |  | $ 117,712 | $ 133,917 | $ 64,156

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