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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Segment Reporting Information [Line Items]      
Cost of services $ 400,782 $ 256,159  
Gross profit 79,727 58,679  
Selling, general and administrative expenses 59,402 42,786  
Contingent consideration 69 0  
Loss (gain) on sale of assets (5) (10)  
Operating income (loss) 20,261 15,903  
Depreciation and amortization expense 6,214 4,020  
Capital expenditures 12,339 1,182  
Total assets 785,228 609,370 $ 766,622
Revenues 480,509 314,838  
Commercial and Industrial [Member]      
Segment Reporting Information [Line Items]      
Cost of services 60,378 56,915  
Gross profit 8,870 5,675  
Selling, general and administrative expenses 7,268 6,424  
Loss (gain) on sale of assets (7) (9)  
Operating income (loss) 1,609 (740)  
Depreciation and amortization expense 630 694  
Capital expenditures 245 268  
Total assets 94,157 72,148  
Revenues 69,248 62,590  
Communications [Member]      
Segment Reporting Information [Line Items]      
Cost of services 106,891 79,817  
Gross profit 20,498 18,539  
Selling, general and administrative expenses 11,384 9,341  
Loss (gain) on sale of assets (6) 0  
Operating income (loss) 9,120 9,198  
Depreciation and amortization expense 359 347  
Capital expenditures 594 132  
Total assets 161,419 137,457  
Revenues 127,389 98,356  
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Cost of services 34,375 23,464  
Gross profit 7,721 10,937  
Selling, general and administrative expenses 6,059 5,611  
Loss (gain) on sale of assets 0 (1)  
Operating income (loss) 1,662 5,327  
Depreciation and amortization expense 1,343 1,441  
Capital expenditures 10,316 345  
Total assets 145,722 129,283  
Revenues 42,096 34,401  
Residential [Member]      
Segment Reporting Information [Line Items]      
Cost of services 199,138 95,963  
Gross profit 42,638 23,528  
Selling, general and administrative expenses 30,995 17,327  
Contingent consideration 69    
Loss (gain) on sale of assets 8 0  
Operating income (loss) 11,566 6,201  
Depreciation and amortization expense 3,852 1,504  
Capital expenditures 1,184 437  
Total assets 338,824 198,227  
Revenues 241,776 119,491  
Corporate Segment [Member]      
Segment Reporting Information [Line Items]      
Cost of services 0 0  
Gross profit 0 0  
Selling, general and administrative expenses 3,696 4,083  
Loss (gain) on sale of assets 0 0  
Operating income (loss) (3,696) (4,083)  
Depreciation and amortization expense 30 34  
Capital expenditures 0 0  
Total assets 45,106 72,255  
Revenues $ 0 $ 0