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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Segment Reporting Information [Line Items]          
Revenues $ 293,125 $ 282,633 $ 860,445 $ 783,389  
Cost of services 234,805 236,236 700,646 652,156  
Gross profit 58,320 46,397 159,799 131,233  
Selling, general and administrative expenses 44,261 36,333 124,169 103,489  
Contingent consideration 0 (163) 0 (278)  
Loss (gain) on sale of assets (3) (8) (40) 87  
Operating income (loss) 14,062 10,235 35,670 27,935  
Depreciation and amortization expense 3,200 2,354 8,797 7,200  
Capital expenditures 802 1,243 3,700 5,172  
Total assets 525,325 438,364 525,325 438,364 $ 445,258
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Revenues 56,778 75,370 190,481 227,928  
Cost of services 52,212 69,171 174,712 204,263  
Gross profit 4,566 6,199 15,769 23,665  
Selling, general and administrative expenses 8,786 6,827 24,660 20,906  
Contingent consideration   0   0  
Loss (gain) on sale of assets (6) (4) (34) (8)  
Operating income (loss) (4,214) (624) (8,857) 2,767  
Depreciation and amortization expense 692 652 2,057 1,907  
Capital expenditures 496 507 1,168 1,974  
Total assets 71,877 81,693 71,877 81,693  
Communications [Member]          
Segment Reporting Information [Line Items]          
Revenues 96,500 90,438 276,779 230,200  
Cost of services 77,792 75,044 225,866 190,895  
Gross profit 18,708 15,394 50,913 39,305  
Selling, general and administrative expenses 9,316 8,406 27,304 23,006  
Contingent consideration   0   0  
Loss (gain) on sale of assets 0 0 (9) 0  
Operating income (loss) 9,392 6,988 23,618 16,299  
Depreciation and amortization expense 330 339 1,010 1,180  
Capital expenditures 63 74 531 767  
Total assets 131,796 111,270 131,796 111,270  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Revenues 31,942 36,109 92,525 100,038  
Cost of services 22,609 27,671 68,177 78,227  
Gross profit 9,333 8,438 24,348 21,811  
Selling, general and administrative expenses 5,512 4,937 14,923 14,103  
Contingent consideration   (163)   (278)  
Loss (gain) on sale of assets 3 (4) 3 97  
Operating income (loss) 3,818 3,668 9,422 7,889  
Depreciation and amortization expense 1,683 1,122 4,557 3,391  
Capital expenditures 135 311 725 1,133  
Total assets 126,557 118,143 126,557 118,143  
Residential [Member]          
Segment Reporting Information [Line Items]          
Revenues 107,905 80,716 300,660 225,223  
Cost of services 82,192 64,350 231,891 178,771  
Gross profit 25,713 16,366 68,769 46,452  
Selling, general and administrative expenses 16,767 11,812 46,241 34,136  
Contingent consideration   0   0  
Loss (gain) on sale of assets 0 0 0 (2)  
Operating income (loss) 8,946 4,554 22,528 12,318  
Depreciation and amortization expense 476 218 1,117 644  
Capital expenditures 108 329 977 1,174  
Total assets 107,919 57,866 107,919 57,866  
Corporate Segment [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 expenses 3,880 4,351 11,041 11,338  
Contingent consideration   0   0  
Loss (gain) on sale of assets 0 0 0 0  
Operating income (loss) (3,880) (4,351) (11,041) (11,338)  
Depreciation and amortization expense 19 23 56 78  
Capital expenditures 0 22 299 124  
Total assets $ 87,176 $ 69,392 $ 87,176 $ 69,392