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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Cost of services $ 650,561 $ 573,634 $ 1,847,172 $ 1,598,394  
Gross profit 239,597 194,781 626,493 510,198  
Selling, general and administrative expenses 127,334 104,694 346,417 285,816  
Contingent consideration 338 43 1,016 78  
Loss (gain) on sale of assets 23 (132) (156) (1,576)  
Operating income (loss) 111,902 90,176 279,216 225,880  
Depreciation and amortization expense 11,664 10,613 34,699 26,051  
Capital expenditures 17,148 17,532 47,270 30,891  
Total assets 1,469,722 1,155,336 1,469,722 1,155,336 $ 1,244,026
Revenues 890,158 768,415 2,473,665 2,108,592  
Noncontrolling Interest, Change in Redemption Value 560   2,142 21,260  
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Cost of services 92,417 74,860 264,297 222,711  
Gross profit 23,002 21,694 64,971 55,864  
Selling, general and administrative expenses 10,055 8,717 29,143 24,271  
Loss (gain) on sale of assets (2) (52) (29) (105)  
Operating income (loss) 12,949 13,029 35,857 31,698  
Depreciation and amortization expense 752 517 1,937 1,477  
Capital expenditures 2,709 801 7,840 3,019  
Total assets 104,406 97,741 104,406 97,741  
Revenues 115,419 96,554 329,268 278,575  
Communications [Member]          
Segment Reporting Information [Line Items]          
Cost of services 226,089 155,184 620,211 444,225  
Gross profit 73,124 37,119 184,978 112,329  
Selling, general and administrative expenses 25,416 16,122 69,095 48,011  
Loss (gain) on sale of assets (14) (7) (73) (27)  
Operating income (loss) 47,722 21,004 115,956 64,345  
Depreciation and amortization expense 1,403 931 3,861 2,520  
Capital expenditures 6,370 6,319 17,422 8,255  
Total assets 371,190 262,677 371,190 262,677  
Revenues 299,213 192,303 805,189 556,554  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Cost of services 83,329 71,366 234,801 168,107  
Gross profit 46,159 30,656 120,432 72,592  
Selling, general and administrative expenses 13,114 10,886 36,869 25,798  
Contingent consideration 338 43 1,016 43  
Loss (gain) on sale of assets 35 (3) 105 (3)  
Operating income (loss) 32,672 19,730 82,442 46,754  
Depreciation and amortization expense 3,338 3,656 10,953 6,112  
Capital expenditures 4,230 4,862 9,340 6,897  
Total assets 344,026 289,619 344,026 289,619  
Revenues 129,488 102,022 355,233 240,699  
Residential [Member]          
Segment Reporting Information [Line Items]          
Cost of services 248,726 272,224 727,863 763,351  
Gross profit 97,312 105,312 256,112 269,413  
Selling, general and administrative expenses 63,932 61,662 176,395 168,298  
Contingent consideration 0 0 0 35  
Loss (gain) on sale of assets 4 (70) (159) (1,427)  
Operating income (loss) 33,376 43,720 79,876 102,507  
Depreciation and amortization expense 5,937 5,282 17,261 15,256  
Capital expenditures 3,019 5,279 9,108 12,067  
Total assets 371,752 400,539 371,752 400,539  
Revenues 346,038 377,536 983,975 1,032,764  
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 14,817 7,307 34,915 19,438  
Contingent consideration   0      
Loss (gain) on sale of assets 0 0 0 (14)  
Operating income (loss) (14,817) (7,307) (34,915) (19,424)  
Depreciation and amortization expense 234 227 687 686  
Capital expenditures 820 271 3,560 653  
Total assets 278,348 104,760 278,348 104,760  
Revenues $ 0 $ 0 $ 0 $ 0