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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Segment Reporting Information [Line Items]          
Revenues $ 208,323 $ 179,599 $ 604,163 $ 490,347  
Cost of Services 172,925 145,602 501,769 400,905  
Gross Profit 35,398 33,997 102,394 89,442  
Selling, General and Administrative Expense 30,771 25,716 89,085 72,494  
Contingent Consideration Expense (33) 66 50 332  
Loss (gain) on sale of assets (55) 34 (68) 811  
Operating Income 4,715 8,181 13,327 15,805  
Depreciation and amortization 2,506 1,656 6,884 3,503  
Capital Expenditures 905 1,072 3,796 2,156  
Assets 417,157 277,523 417,157 277,523 $ 394,340
Communications [Member]          
Segment Reporting Information [Line Items]          
Revenues 57,081 48,702 172,058 128,813  
Cost of Services 46,958 40,487 144,668 105,855  
Gross Profit 10,123 8,215 27,390 22,958  
Selling, General and Administrative Expense 6,252 5,185 18,086 14,877  
Loss (gain) on sale of assets 0 0 (1) 0  
Operating Income 3,871 3,030 9,305 8,081  
Depreciation and amortization 187 153 532 410  
Capital Expenditures 328 122 1,888 685  
Assets 70,427 53,711 70,427 53,711  
Residential [Member]          
Segment Reporting Information [Line Items]          
Revenues 70,162 56,867 204,527 162,381  
Cost of Services 54,307 43,388 157,370 124,459  
Gross Profit 15,855 13,479 47,157 37,922  
Selling, General and Administrative Expense 11,003 9,237 32,488 26,856  
Loss (gain) on sale of assets 37 0 34 0  
Operating Income 4,815 4,242 14,635 11,066  
Depreciation and amortization 135 122 436 364  
Capital Expenditures 170 393 517 537  
Assets 51,995 40,008 51,995 40,008  
Commercial & Industrial [Member]          
Segment Reporting Information [Line Items]          
Revenues 58,778 59,512 168,006 158,923  
Cost of Services 54,174 51,882 154,628 141,237  
Gross Profit 4,604 7,630 13,378 17,686  
Selling, General and Administrative Expense 4,849 4,771 14,434 13,014  
Loss (gain) on sale of assets (4) (17) (11) (17)  
Operating Income (241) 2,876 (1,045) 4,689  
Depreciation and amortization 329 410 983 845  
Capital Expenditures 283 377 927 563  
Assets 66,190 58,559 66,190 58,559  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Revenues 22,302 14,518 59,572 40,230  
Cost of Services 17,486 9,845 45,103 29,354  
Gross Profit 4,816 4,673 14,469 10,876  
Selling, General and Administrative Expense 4,958 3,248 13,280 9,062  
Contingent Consideration Expense (33) 66 50 332  
Loss (gain) on sale of assets (88) 51 (90) 828  
Operating Income (21) 1,308 1,229 654  
Depreciation and amortization 1,785 897 4,730 1,674  
Capital Expenditures 124 109 261 300  
Assets 103,323 92,559 103,323 92,559  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Cost of Services 0 0 0 0  
Gross Profit 0 0 0 0  
Selling, General and Administrative Expense 3,709 3,275 10,797 8,685  
Loss (gain) on sale of assets 0 0 0 0  
Operating Income (3,709) (3,275) (10,797) (8,685)  
Depreciation and amortization 70 74 203 210  
Capital Expenditures 0 71 203 71  
Assets $ 125,222 $ 32,686 $ 125,222 $ 32,686