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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Revenues $ 314,838 $ 276,043  
Cost of services 256,159 225,828  
Gross profit 58,679 50,215  
Selling, general and administrative expenses 42,786 37,872  
Loss (gain) on sale of assets (10) (36)  
Operating income (loss) 15,903 12,379  
Depreciation and amortization expense 4,020 2,362  
Capital expenditures 1,182 1,391  
Total assets 609,370 469,865 $ 560,528
Commercial and Industrial [Member]      
Segment Reporting Information [Line Items]      
Revenues 62,590 67,743  
Cost of services 56,915 61,008  
Gross profit 5,675 6,735  
Selling, general and administrative expenses 6,424 7,288  
Loss (gain) on sale of assets (9) (27)  
Operating income (loss) (740) (526)  
Depreciation and amortization expense 694 676  
Capital expenditures 268 460  
Total assets 72,148 80,612  
Communications [Member]      
Segment Reporting Information [Line Items]      
Revenues 98,356 84,289  
Cost of services 79,817 68,722  
Gross profit 18,539 15,567  
Selling, general and administrative expenses 9,341 8,569  
Loss (gain) on sale of assets 0 (9)  
Operating income (loss) 9,198 7,007  
Depreciation and amortization expense 347 337  
Capital expenditures 132 282  
Total assets 137,457 113,574  
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenues 34,401 31,283  
Cost of services 23,464 23,513  
Gross profit 10,937 7,770  
Selling, general and administrative expenses 5,611 4,493  
Loss (gain) on sale of assets (1) 0  
Operating income (loss) 5,327 3,277  
Depreciation and amortization expense 1,441 1,120  
Capital expenditures 345 437  
Total assets 129,283 112,413  
Residential [Member]      
Segment Reporting Information [Line Items]      
Revenues 119,491 92,728  
Cost of services 95,963 72,585  
Gross profit 23,528 20,143  
Selling, general and administrative expenses 17,327 13,720  
Loss (gain) on sale of assets 0 0  
Operating income (loss) 6,201 6,423  
Depreciation and amortization expense 1,504 210  
Capital expenditures 437 212  
Total assets 198,227 77,109  
Corporate Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Cost of services 0 0  
Gross profit 0 0  
Selling, general and administrative expenses 4,083 3,802  
Loss (gain) on sale of assets 0 0  
Operating income (loss) (4,083) (3,802)  
Depreciation and amortization expense 34 19  
Capital expenditures 0 0  
Total assets $ 72,255 $ 86,157