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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Segment Reporting Information [Line Items]          
Revenues $ 291,277 $ 256,914 $ 567,320 $ 500,756  
Cost of services 240,013 213,679 465,841 415,920  
Gross profit 51,264 43,235 101,479 84,836  
Selling, general and administrative expenses 42,036 35,070 79,908 67,156  
Contingent consideration 0 (149) 0 (115)  
Loss (gain) on sale of assets (1) 98 (37) 95  
Operating income (loss) 9,229 8,216 21,608 17,700  
Depreciation and amortization expense 3,235 2,474 5,597 4,846  
Capital expenditures 1,507 1,841 2,898 3,929  
Total assets 526,344 417,271 526,344 417,271 $ 445,258
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Revenues 65,960 79,975 133,703 152,558  
Cost of services 61,492 71,184 122,500 135,092  
Gross profit 4,468 8,791 11,203 17,466  
Selling, general and administrative expenses 8,586 7,363 15,874 14,079  
Contingent consideration   0   0  
Loss (gain) on sale of assets (1) (1) (28) (4)  
Operating income (loss) (4,117) 1,429 (4,643) 3,391  
Depreciation and amortization expense 689 629 1,365 1,255  
Capital expenditures 212 615 672 1,467  
Total assets 75,075 77,898 75,075 77,898  
Communications [Member]          
Segment Reporting Information [Line Items]          
Revenues 95,990 70,437 180,279 139,762  
Cost of services 79,352 58,492 148,074 115,851  
Gross profit 16,638 11,945 32,205 23,911  
Selling, general and administrative expenses 9,419 7,666 17,988 14,600  
Contingent consideration   0   0  
Loss (gain) on sale of assets 0 0 (9) 0  
Operating income (loss) 7,219 4,279 14,226 9,311  
Depreciation and amortization expense 343 426 680 841  
Capital expenditures 186 193 468 693  
Total assets 126,871 91,960 126,871 91,960  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Revenues 29,300 34,450 60,583 63,929  
Cost of services 22,055 27,004 45,568 50,556  
Gross profit 7,245 7,446 15,015 13,373  
Selling, general and administrative expenses 4,918 4,685 9,411 9,166  
Contingent consideration   (149)   (115)  
Loss (gain) on sale of assets 0 101 0 101  
Operating income (loss) 2,327 2,809 5,604 4,221  
Depreciation and amortization expense 1,754 1,175 2,874 2,269  
Capital expenditures 153 635 590 822  
Total assets 127,426 114,739 127,426 114,739  
Residential [Member]          
Segment Reporting Information [Line Items]          
Revenues 100,027 72,052 192,755 144,507  
Cost of services 77,114 56,999 149,699 114,421  
Gross profit 22,913 15,053 43,056 30,086  
Selling, general and administrative expenses 15,754 11,187 29,474 22,324  
Contingent consideration   0   0  
Loss (gain) on sale of assets 0 (2) 0 (2)  
Operating income (loss) 7,159 3,868 13,582 7,764  
Depreciation and amortization expense 431 217 641 426  
Capital expenditures 657 398 869 845  
Total assets 101,246 55,417 101,246 55,417  
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 3,359 4,169 7,161 6,987  
Contingent consideration   0   0  
Loss (gain) on sale of assets 0 0 0 0  
Operating income (loss) (3,359) (4,169) (7,161) (6,987)  
Depreciation and amortization expense 18 27 37 55  
Capital expenditures 299 0 299 102  
Total assets $ 95,726 $ 77,257 $ 95,726 $ 77,257