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Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Revenues $ 3,371,468 $ 2,884,358 $ 2,377,227
Cost of services 2,511,971 2,187,768 1,932,688
Gross profit 859,497 696,590 444,539
Selling, general and administrative expenses 474,978 396,684 298,625
Contingent consideration 1,145 714 277
Loss (gain) on sale of assets (155) (1,684) (14,139)
Operating income (loss) 383,529 300,876 159,776
Depreciation and amortization 46,941 37,103 29,407
Capital expenditures 67,253 45,159 17,667
Total assets 1,595,661 1,244,026 981,600
Communications [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,140,640 776,474 600,776
Cost of services 876,037 623,844 494,964
Gross profit 264,603 152,630 105,812
Selling, general and administrative expenses 98,187 65,752 54,344
Contingent consideration 0 0 0
Loss (gain) on sale of assets (89) (18) 12
Operating income (loss) 166,505 86,896 51,456
Depreciation and amortization 5,481 3,627 2,215
Capital expenditures 27,899 13,493 2,203
Total assets 439,919 285,478 205,924
Residential [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,304,369 1,388,840 1,279,504
Cost of services 967,920 1,024,440 1,026,524
Gross profit 336,449 364,400 252,980
Selling, general and administrative expenses 232,789 228,371 169,737
Contingent consideration 0 36 277
Loss (gain) on sale of assets (132) (1,354) 69
Operating income (loss) 103,792 137,347 82,897
Depreciation and amortization 23,320 20,752 19,281
Capital expenditures 11,351 15,620 9,114
Total assets 356,539 395,682 386,829
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenues 498,724 351,096 217,353
Cost of services 327,202 245,743 162,905
Gross profit 171,522 105,353 54,448
Selling, general and administrative expenses 51,813 37,394 26,260
Contingent consideration 1,145 678 0
Loss (gain) on sale of assets 97 (184) (1,029)
Operating income (loss) 118,467 67,465 29,217
Depreciation and amortization 14,420 9,783 5,198
Capital expenditures 12,046 8,916 2,767
Total assets 355,087 288,765 180,871
Commercial and Industrial [Member]      
Segment Reporting Information [Line Items]      
Revenues 427,735 367,948 279,594
Cost of services 340,812 293,741 248,295
Gross profit 86,923 74,207 31,299
Selling, general and administrative expenses 39,695 32,925 25,225
Contingent consideration 0 0 0
Loss (gain) on sale of assets (31) (114) (13,198)
Operating income (loss) 47,259 41,396 19,272
Depreciation and amortization 2,792 2,028 1,640
Capital expenditures 11,300 5,205 2,525
Total assets 113,123 89,023 87,677
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 52,494 32,242 23,059
Contingent consideration 0 0 0
Loss (gain) on sale of assets 0 (14) 7
Operating income (loss) (52,494) (32,228) (23,066)
Depreciation and amortization 928 913 1,073
Capital expenditures 4,657 1,925 1,058
Total assets $ 330,993 $ 185,078 $ 120,299