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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