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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Segment Reporting Information [Line Items]          
Cost of services $ 534,120 $ 467,955 $ 1,024,760 $ 947,391  
Gross profit 171,613 100,926 315,417 196,364  
Selling, general and administrative expenses 95,272 69,349 181,122 137,117  
Contingent consideration 0 69 35 138  
Loss (gain) on sale of assets (1,373) (102) (1,444) (13,162)  
Operating income (loss) 77,714 31,610 135,704 72,271  
Depreciation and amortization expense 7,821 6,864 15,438 13,252  
Capital expenditures 6,844 3,965 13,359 6,677  
Total assets 1,101,164 889,088 1,101,164 889,088 $ 981,600
Revenues 705,733 568,881 1,340,177 1,143,755  
Noncontrolling Interest, Change in Redemption Value 5,941 2,771 8,723 5,826  
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Cost of services 76,806 62,296 147,851 118,949  
Gross profit 20,263 6,737 34,170 10,351  
Selling, general and administrative expenses 8,707 6,400 15,554 12,089  
Loss (gain) on sale of assets (68) (99) (53) (13,134)  
Operating income (loss) 11,624 436 18,669 11,396  
Depreciation and amortization expense 485 412 960 804  
Capital expenditures 1,397 546 2,218 1,269  
Total assets 98,845 87,721 98,845 87,721  
Revenues 97,069 69,033 182,021 129,300  
Communications [Member]          
Segment Reporting Information [Line Items]          
Cost of services 154,568 115,957 289,041 241,464  
Gross profit 38,935 25,163 75,210 46,901  
Selling, general and administrative expenses 16,988 13,386 31,889 25,683  
Loss (gain) on sale of assets (16) (3) (20) (3)  
Operating income (loss) 21,963 11,780 43,341 21,221  
Depreciation and amortization expense 866 502 1,589 932  
Capital expenditures 936 480 1,936 1,122  
Total assets 230,386 188,937 230,386 188,937  
Revenues 193,503 141,120 364,251 288,365  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Cost of services 52,044 38,421 96,741 77,238  
Gross profit 23,745 14,195 41,936 24,662  
Selling, general and administrative expenses 7,627 5,990 14,912 11,751  
Contingent consideration   0      
Loss (gain) on sale of assets 0 0 0 (19)  
Operating income (loss) 16,118 8,205 27,024 12,930  
Depreciation and amortization expense 1,229 1,326 2,456 2,680  
Capital expenditures 884 560 2,035 1,199  
Total assets 200,476 173,621 200,476 173,621  
Revenues 75,789 52,616 138,677 101,900  
Residential [Member]          
Segment Reporting Information [Line Items]          
Cost of services 250,702 251,281 491,127 509,740  
Gross profit 88,670 54,831 164,101 114,450  
Selling, general and administrative expenses 55,258 37,999 106,636 77,050  
Contingent consideration 0 69 35 138  
Loss (gain) on sale of assets (1,275) 0 (1,357) (6)  
Operating income (loss) 34,687 16,763 58,787 37,268  
Depreciation and amortization expense 5,012 4,557 9,974 8,701  
Capital expenditures 3,424 2,379 6,788 3,087  
Total assets 396,760 389,946 396,760 389,946  
Revenues 339,372 306,112 655,228 624,190  
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 6,692 5,574 12,131 10,544  
Contingent consideration   0      
Loss (gain) on sale of assets (14) 0 (14) 0  
Operating income (loss) (6,678) (5,574) (12,117) (10,544)  
Depreciation and amortization expense 229 67 459 135  
Capital expenditures 203 0 382 0  
Total assets 174,697 48,863 174,697 48,863  
Revenues $ 0 $ 0 $ 0 $ 0