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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Segment Reporting Information [Line Items]          
Cost of services $ 573,634 $ 476,842 $ 1,598,394 $ 1,424,233  
Gross profit 194,781 107,609 510,198 303,973  
Selling, general and administrative expenses 104,694 74,300 285,816 211,417  
Contingent consideration 43 70 78 208  
Loss (gain) on sale of assets (132) (1,080) (1,576) (14,242)  
Operating income (loss) 90,176 34,319 225,880 106,590  
Depreciation and amortization expense 10,613 6,878 26,051 20,130  
Capital expenditures 17,532 4,609 30,891 11,286  
Total assets 1,155,336 899,728 1,155,336 899,728 $ 981,600
Revenues 768,415 584,451 2,108,592 1,728,206  
Noncontrolling Interest, Change in Redemption Value 7,333   16,056 11,742  
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Cost of services 74,860 58,872 222,711 177,821  
Gross profit 21,694 8,896 55,864 19,247  
Selling, general and administrative expenses 8,717 6,284 24,271 18,373  
Loss (gain) on sale of assets (52) (13) (105) (13,147)  
Operating income (loss) 13,029 2,625 31,698 14,021  
Depreciation and amortization expense 517 402 1,477 1,206  
Capital expenditures 801 800 3,019 2,069  
Total assets 97,741 84,101 97,741 84,101  
Revenues 96,554 67,768 278,575 197,068  
Communications [Member]          
Segment Reporting Information [Line Items]          
Cost of services 155,184 114,440 444,225 355,904  
Gross profit 37,119 27,175 112,329 74,076  
Selling, general and administrative expenses 16,122 13,680 48,011 39,363  
Loss (gain) on sale of assets (7) (1) (27) (4)  
Operating income (loss) 21,004 13,496 64,345 34,717  
Depreciation and amortization expense 931 498 2,520 1,430  
Capital expenditures 6,319 261 8,255 1,383  
Total assets 262,677 182,117 262,677 182,117  
Revenues 192,303 141,615 556,554 429,980  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Cost of services 71,366 42,851 168,107 120,089  
Gross profit 30,656 14,206 72,592 38,868  
Selling, general and administrative expenses 10,886 7,066 25,798 18,817  
Contingent consideration   0      
Loss (gain) on sale of assets (3) (1,010) (3) (1,029)  
Operating income (loss) 19,730 8,150 46,754 21,080  
Depreciation and amortization expense 3,656 1,300 6,112 3,980  
Capital expenditures 4,862 918 6,897 2,117  
Total assets 289,619 179,363 289,619 179,363  
Revenues 102,022 57,057 240,699 158,957  
Residential [Member]          
Segment Reporting Information [Line Items]          
Cost of services 272,224 260,679 763,351 770,419  
Gross profit 105,312 57,332 269,413 171,782  
Selling, general and administrative expenses 61,662 41,939 168,298 118,989  
Contingent consideration 0 70 35 208  
Loss (gain) on sale of assets (70) (56) (1,427) (62)  
Operating income (loss) 43,720 15,379 102,507 52,647  
Depreciation and amortization expense 5,282 4,609 15,256 13,310  
Capital expenditures 5,279 2,461 12,067 5,548  
Total assets 400,539 381,840 400,539 381,840  
Revenues 377,536 318,011 1,032,764 942,201  
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 7,307 5,331 19,438 15,875  
Contingent consideration   0      
Loss (gain) on sale of assets 0 0 (14) 0  
Operating income (loss) (7,307) (5,331) (19,424) (15,875)  
Depreciation and amortization expense 227 69 686 204  
Capital expenditures 271 169 653 169  
Total assets 104,760 72,307 104,760 72,307  
Revenues $ 0 $ 0 $ 0 $ 0