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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Segment Reporting Information [Line Items]          
Revenues $ 179,599 $ 144,082 $ 490,347 $ 414,170  
Cost of Services 145,602 119,030 400,905 344,707  
Gross Profit 33,997 25,052 89,442 69,463  
Selling, General and Administrative Expense 25,716 20,546 72,494 58,653  
Contingent Consideration Expense 66 0 332 0  
Loss on sale of assets 34 (47) 811 (40)  
Operating Income 8,181 4,553 15,805 10,850  
Depreciation and amortization 1,656 636 3,503 1,806  
Capital Expenditures 1,072 734 2,156 2,385  
Assets 277,523 212,506 277,523 212,506 $ 226,710
Communications [Member]          
Segment Reporting Information [Line Items]          
Revenues 48,702 35,516 128,813 95,269  
Cost of Services 40,487 28,451 105,855 78,132  
Gross Profit 8,215 7,065 22,958 17,137  
Selling, General and Administrative Expense 5,185 4,275 14,877 11,377  
Loss on sale of assets 0 (31) 0 (24)  
Operating Income 3,030 2,821 8,081 5,784  
Depreciation and amortization 153 141 410 388  
Capital Expenditures 122 174 685 644  
Assets 53,711 39,096 53,711 39,096  
Residential [Member]          
Segment Reporting Information [Line Items]          
Revenues 56,867 52,991 162,381 151,753  
Cost of Services 43,388 42,615 124,459 122,523  
Gross Profit 13,479 10,376 37,922 29,230  
Selling, General and Administrative Expense 9,237 7,709 26,856 22,741  
Loss on sale of assets 0 0 0 4  
Operating Income 4,242 2,667 11,066 6,485  
Depreciation and amortization 122 120 364 362  
Capital Expenditures 393 64 537 257  
Assets 40,008 37,690 40,008 37,690  
Commercial & Industrial [Member]          
Segment Reporting Information [Line Items]          
Revenues 59,512 44,406 158,923 132,677  
Cost of Services 51,882 39,161 141,237 117,331  
Gross Profit 7,630 5,245 17,686 15,346  
Selling, General and Administrative Expense 4,771 3,776 13,014 11,155  
Loss on sale of assets (17) (16) (17) (18)  
Operating Income 2,876 1,485 4,689 4,209  
Depreciation and amortization 410 71 845 207  
Capital Expenditures 377 130 563 297  
Assets 58,559 45,776 58,559 45,776  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Revenues 14,518 11,169 40,230 34,471  
Cost of Services 9,845 8,803 29,354 26,721  
Gross Profit 4,673 2,366 10,876 7,750  
Selling, General and Administrative Expense 3,248 2,463 9,062 6,795  
Contingent Consideration Expense 66 0 332 0  
Loss on sale of assets 51 0 828 (2)  
Operating Income 1,308 (97) 654 957  
Depreciation and amortization 897 236 1,674 640  
Capital Expenditures 109 366 300 1,023  
Assets 92,559 28,266 92,559 28,266  
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 3,275 2,323 8,685 6,585  
Loss on sale of assets 0 0 0 0  
Operating Income (3,275) (2,323) (8,685) (6,585)  
Depreciation and amortization 74 68 210 209  
Capital Expenditures 71 0 71 164  
Assets $ 32,686 $ 61,678 $ 32,686 $ 61,678