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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Segment Reporting Information [Line Items]      
Cost of services $ 571,520 $ 490,640  
Gross profit 178,027 143,804  
Selling, general and administrative expenses 103,039 85,850  
Contingent consideration 339 35  
Loss (gain) on sale of assets 30 (71)  
Operating income (loss) 74,619 57,990  
Depreciation and amortization expense 11,087 7,617  
Capital expenditures 13,169 6,515  
Total assets 1,265,009 1,042,019 $ 1,244,026
Revenues 749,547 634,444  
Noncontrolling Interest, Change in Redemption Value 1,514 3,683  
Commercial and Industrial [Member]      
Segment Reporting Information [Line Items]      
Cost of services 73,375 71,045  
Gross profit 15,116 13,907  
Selling, general and administrative expenses 8,064 6,847  
Loss (gain) on sale of assets (4) 15  
Operating income (loss) 7,056 7,045  
Depreciation and amortization expense 573 475  
Capital expenditures 2,982 821  
Total assets 99,668 101,621  
Revenues 88,491 84,952  
Communications [Member]      
Segment Reporting Information [Line Items]      
Cost of services 184,149 134,473  
Gross profit 48,811 36,275  
Selling, general and administrative expenses 20,238 14,901  
Loss (gain) on sale of assets (38) (4)  
Operating income (loss) 28,611 21,378  
Depreciation and amortization expense 1,203 723  
Capital expenditures 4,680 1,000  
Total assets 294,246 215,475  
Revenues 232,960 170,748  
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Cost of services 73,153 44,697  
Gross profit 34,972 18,191  
Selling, general and administrative expenses 11,268 7,285  
Contingent consideration 339 0  
Loss (gain) on sale of assets 79 0  
Operating income (loss) 23,286 10,906  
Depreciation and amortization expense 3,673 1,227  
Capital expenditures 2,111 1,151  
Total assets 272,625 185,875  
Revenues 108,125 62,888  
Residential [Member]      
Segment Reporting Information [Line Items]      
Cost of services 240,843 240,425  
Gross profit 79,128 75,431  
Selling, general and administrative expenses 55,312 51,378  
Contingent consideration 0 35  
Loss (gain) on sale of assets (7) (82)  
Operating income (loss) 23,823 24,100  
Depreciation and amortization expense 5,411 4,962  
Capital expenditures 2,341 3,364  
Total assets 390,468 388,808  
Revenues 319,971 315,856  
Corporate Segment [Member]      
Segment Reporting Information [Line Items]      
Cost of services 0 0  
Gross profit 0 0  
Selling, general and administrative expenses 8,157 5,439  
Contingent consideration   0  
Loss (gain) on sale of assets 0 0  
Operating income (loss) (8,157) (5,439)  
Depreciation and amortization expense 227 230  
Capital expenditures 1,055 179  
Total assets 208,002 150,240  
Revenues $ 0 $ 0