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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Segment Reporting Information [Line Items]          
Cost of services $ 443,086 $ 267,087 $ 843,868 $ 523,246  
Gross profit 58,507 64,874 138,234 123,553  
Selling, general and administrative expenses 63,430 47,655 122,832 90,441  
Contingent consideration 69   138 73  
Loss (gain) on sale of assets (68) (18) (73) 8  
Operating income (loss) (4,924) 17,128 15,337 33,031  
Depreciation and amortization expense 6,156 5,828 12,370 9,848  
Capital expenditures 9,288 1,822 21,627 3,004  
Total assets 831,239 615,652 831,239 615,652 $ 766,622
Revenues 501,593 331,961 982,102 646,799  
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Cost of services 74,034 46,441 134,412 103,356  
Gross profit (5,219) 5,582 3,651 11,257  
Selling, general and administrative expenses 8,448 6,744 15,716 13,168  
Loss (gain) on sale of assets (33) (8) (40) (17)  
Operating income (loss) (13,634) (1,154) (12,025) (1,894)  
Depreciation and amortization expense 647 683 1,277 1,377  
Capital expenditures 840 397 1,085 665  
Total assets 99,262 69,405 99,262 69,405  
Revenues 68,815 52,023 138,063 114,613  
Communications [Member]          
Segment Reporting Information [Line Items]          
Cost of services 119,518 75,339 226,408 155,156  
Gross profit 11,121 19,547 31,620 38,086  
Selling, general and administrative expenses 10,978 9,615 22,363 18,956  
Loss (gain) on sale of assets (7) 0 (13) 0  
Operating income (loss) 150 9,932 9,270 19,130  
Depreciation and amortization expense 362 347 721 694  
Capital expenditures 750 133 1,344 265  
Total assets 171,929 128,568 171,929 128,568  
Revenues 130,639 94,886 258,028 193,242  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Cost of services 34,672 25,161 69,048 48,625  
Gross profit 7,061 9,555 14,781 20,492  
Selling, general and administrative expenses 6,391 6,242 12,449 11,853  
Loss (gain) on sale of assets (28) (26) (28) (27)  
Operating income (loss) 698 3,339 2,360 8,666  
Depreciation and amortization expense 1,385 1,554 2,728 2,995  
Capital expenditures 823 163 11,139 508  
Total assets 150,276 134,037 150,276 134,037  
Revenues 41,733 34,716 83,829 69,117  
Residential [Member]          
Segment Reporting Information [Line Items]          
Cost of services 214,862 120,146 414,000 216,109  
Gross profit 45,544 30,190 88,182 53,718  
Selling, general and administrative expenses 33,576 21,609 64,571 38,936  
Contingent consideration 69 73 138 73  
Loss (gain) on sale of assets 0 52 8 52  
Operating income (loss) 11,899 8,456 23,465 14,657  
Depreciation and amortization expense 3,721 3,205 7,573 4,709  
Capital expenditures 6,707 1,040 7,891 1,477  
Total assets 363,921 215,399 363,921 215,399  
Revenues 260,406 150,336 502,182 269,827  
Corporate Segment [Member]          
Segment Reporting Information [Line Items]          
Cost of services 0 0 0 0  
Gross profit 0 0 0 0  
Selling, general and administrative expenses 4,037 3,445 7,733 7,528  
Loss (gain) on sale of assets 0 0 0 0  
Operating income (loss) (4,037) (3,445) (7,733) (7,528)  
Depreciation and amortization expense 41 39 71 73  
Capital expenditures 168 89 168 89  
Total assets 45,851 68,243 45,851 68,243  
Revenues $ 0 $ 0 $ 0 $ 0