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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Segment Reporting Information [Line Items]          
Revenues $ 232,576 $ 208,323 $ 636,553 $ 604,163  
Cost of services 190,039 172,925 527,112 501,769  
Gross profit 42,537 35,398 109,441 102,394  
Selling, general and administrative expenses 32,372 30,771 92,108 89,085  
Contingent consideration 81 (33) 152 50  
Loss (gain) on sale of assets (5) (55) (39) (68)  
Operating income (loss) 10,089 4,715 17,220 13,327  
Depreciation and amortization expense 2,437 2,506 6,706 6,884  
Capital expenditures 1,056 905 3,383 3,796  
Total assets 395,963 417,157 395,963 417,157 $ 424,494
Commercial & Industrial [Member]          
Segment Reporting Information [Line Items]          
Revenues 78,156 58,778 196,747 168,006  
Cost of services 67,839 54,174 175,066 154,628  
Gross profit 10,317 4,604 21,681 13,378  
Selling, general and administrative expenses 6,980 4,849 19,624 14,434  
Loss (gain) on sale of assets (6) (4) (35) (11)  
Operating income (loss) 3,343 (241) 2,092 (1,045)  
Depreciation and amortization expense 548 329 1,632 983  
Capital expenditures 715 283 1,638 927  
Total assets 86,012 66,190 86,012 66,190  
Communications [Member]          
Segment Reporting Information [Line Items]          
Revenues 54,368 57,081 159,071 172,058  
Cost of services 43,436 46,958 129,667 144,668  
Gross profit 10,932 10,123 29,404 27,390  
Selling, general and administrative expenses 7,193 6,252 19,478 18,086  
Loss (gain) on sale of assets 0 0 (9) (1)  
Operating income (loss) 3,739 3,871 9,935 9,305  
Depreciation and amortization expense 595 187 1,030 532  
Capital expenditures 119 328 592 1,888  
Total assets 67,270 70,427 67,270 70,427  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Revenues 24,856 22,302 70,407 59,572  
Cost of services 18,701 17,486 54,543 45,103  
Gross profit 6,155 4,816 15,864 14,469  
Selling, general and administrative expenses 4,568 4,958 13,762 13,280  
Contingent consideration 81 (33) 152 50  
Loss (gain) on sale of assets 1 (88) 6 (90)  
Operating income (loss) 1,505 (21) 1,944 1,229  
Depreciation and amortization expense 1,120 1,785 3,503 4,730  
Capital expenditures 112 124 457 261  
Total assets 102,233 103,323 102,233 103,323  
Residential [Member]          
Segment Reporting Information [Line Items]          
Revenues 75,196 70,162 210,328 204,527  
Cost of services 60,063 54,307 167,836 157,370  
Gross profit 15,133 15,855 42,492 47,157  
Selling, general and administrative expenses 10,941 11,003 30,995 32,488  
Loss (gain) on sale of assets 0 37 (1) 34  
Operating income (loss) 4,192 4,815 11,498 14,635  
Depreciation and amortization expense 156 135 452 436  
Capital expenditures 110 170 696 517  
Total assets 52,500 51,995 52,500 51,995  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Revenues 0 0      
Cost of services 0 0      
Gross profit 0 0      
Selling, general and administrative expenses 2,690 3,709 8,249 10,797  
Loss (gain) on sale of assets 0 0      
Operating income (loss) (2,690) (3,709) (8,249) (10,797)  
Depreciation and amortization expense 18 70 89 203  
Capital expenditures 0 0   203  
Total assets $ 87,948 $ 125,222 $ 87,948 $ 125,222