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Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Revenues $ 2,884,358 $ 2,377,227 $ 2,166,808
Cost of services 2,187,768 1,932,688 1,847,878
Gross profit 696,590 444,539 318,930
Selling, general and administrative expenses 396,684 298,625 262,714
Contingent consideration 714 277 277
Loss (gain) on sale of assets (1,684) (14,139) (69)
Operating income (loss) 300,876 159,776 56,008
Depreciation and amortization 37,103 29,407 25,468
Capital expenditures 45,159 17,667 29,255
Total assets 1,244,026 981,600 934,709
Communications [Member]      
Segment Reporting Information [Line Items]      
Revenues 776,474 600,776 559,777
Cost of services 623,844 494,964 490,959
Gross profit 152,630 105,812 68,818
Selling, general and administrative expenses 65,752 54,344 46,717
Contingent consideration 0 0 0
Loss (gain) on sale of assets (18) 12 12
Operating income (loss) 86,896 51,456 22,089
Depreciation and amortization 3,627 2,215 1,550
Capital expenditures 13,493 2,203 2,004
Total assets 285,478 205,924 210,875
Residential [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,388,840 1,279,504 1,131,414
Cost of services 1,024,440 1,026,524 928,161
Gross profit 364,400 252,980 203,253
Selling, general and administrative expenses 228,371 169,737 144,100
Contingent consideration 36 277 277
Loss (gain) on sale of assets (1,354) 69 20
Operating income (loss) 137,347 82,897 58,856
Depreciation and amortization 20,752 19,281 15,617
Capital expenditures 15,620 9,114 10,054
Total assets 395,682 386,829 394,757
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenues 351,096 217,353 167,113
Cost of services 245,743 162,905 138,444
Gross profit 105,353 54,448 28,669
Selling, general and administrative expenses 37,394 26,260 25,129
Contingent consideration 678 0 0
Loss (gain) on sale of assets (184) (1,029) (46)
Operating income (loss) 67,465 29,217 3,586
Depreciation and amortization 9,783 5,198 5,575
Capital expenditures 8,916 2,767 14,729
Total assets 288,765 180,871 161,828
Commercial and Industrial [Member]      
Segment Reporting Information [Line Items]      
Revenues 367,948 279,594 308,504
Cost of services 293,741 248,295 290,314
Gross profit 74,207 31,299 18,190
Selling, general and administrative expenses 32,925 25,225 30,557
Contingent consideration 0 0 0
Loss (gain) on sale of assets (114) (13,198) (55)
Operating income (loss) 41,396 19,272 (12,312)
Depreciation and amortization 2,028 1,640 2,561
Capital expenditures 5,205 2,525 1,890
Total assets 89,023 87,677 114,529
Corporate Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Cost of services 0 0 0
Gross profit 0 0 0
Selling, general and administrative expenses 32,242 23,059 16,211
Contingent consideration 0 0 0
Loss (gain) on sale of assets (14) 7 0
Operating income (loss) (32,228) (23,066) (16,211)
Depreciation and amortization 913 1,073 165
Capital expenditures 1,925 1,058 578
Total assets $ 185,078 $ 120,299 $ 52,720