v3.26.1
Operating Segments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
business
Mar. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Segment Reporting [Line Items]          
Cost of services $ 719,497 $ 625,091 $ 1,370,440 $ 1,196,611  
Gross profit 254,787 208,869 474,802 386,896  
Selling, general and administrative expenses 142,442 116,044 264,257 219,083  
Contingent consideration 129 339 258 678  
Loss (gain) on sale of assets (39) (209) 299 (179)  
Operating income (loss) 112,255 92,695 209,988 167,314  
Depreciation and amortization expense 16,091 11,948 28,765 23,035  
Capital expenditures 31,833 16,953 78,407 30,122  
Total assets 1,994,038 1,364,559 1,994,038 1,364,559 $ 1,595,661
Revenues 974,284 833,960 1,845,242 1,583,507  
Noncontrolling Interest, Change in Redemption Value     $ 723 1,401  
Number of Reportable Segments | business     4    
Commercial and Industrial [Member]          
Segment Reporting [Line Items]          
Cost of services 90,379 98,505 $ 165,047 171,880  
Gross profit 36,145 26,853 56,296 41,969  
Selling, general and administrative expenses 14,751 11,024 25,268 19,088  
Loss (gain) on sale of assets (33) (23) (102) (27)  
Operating income (loss) 21,427 15,852 31,130 22,908  
Depreciation and amortization expense 1,059 612 1,989 1,185  
Capital expenditures 3,515 2,149 5,443 5,131  
Total assets 220,919 121,990 220,919 121,990  
Revenues 126,524 125,358 221,343 213,849  
Communications [Member]          
Segment Reporting [Line Items]          
Cost of services 273,970 209,973 539,500 394,122  
Gross profit 93,726 63,043 180,116 111,854  
Selling, general and administrative expenses 32,567 23,441 61,007 43,679  
Loss (gain) on sale of assets (1) (21) 512 (59)  
Operating income (loss) 61,160 39,623 118,597 68,234  
Depreciation and amortization expense 1,836 1,255 3,644 2,458  
Capital expenditures 22,296 6,372 44,834 11,052  
Total assets 472,610 343,356 472,610 343,356  
Revenues 367,696 273,016 719,616 505,976  
Infrastructure Solutions [Member]          
Segment Reporting [Line Items]          
Cost of services 129,328 78,319 218,962 151,472  
Gross profit 63,120 39,301 113,661 74,273  
Selling, general and administrative expenses 21,050 12,487 35,957 23,755  
Contingent consideration 129 339 258 678  
Loss (gain) on sale of assets (2) (9) (97) 70  
Operating income (loss) 41,943 26,484 77,543 49,770  
Depreciation and amortization expense 6,482 3,942 10,386 7,615  
Capital expenditures 4,617 2,999 6,909 5,110  
Total assets 582,557 328,027 582,557 328,027  
Revenues 192,448 117,620 332,623 225,745  
Residential [Member]          
Segment Reporting [Line Items]          
Cost of services 225,820 238,294 446,931 479,137  
Gross profit 61,796 79,672 124,729 158,800  
Selling, general and administrative expenses 55,375 57,151 109,457 112,463  
Contingent consideration 0 0 0 0  
Loss (gain) on sale of assets (3) (156) (14) (163)  
Operating income (loss) 6,424 22,677 15,286 46,500  
Depreciation and amortization expense 6,363 5,913 12,081 11,324  
Capital expenditures 1,361 3,748 2,701 6,089  
Total assets 342,980 379,510 342,980 379,510  
Revenues 287,616 317,966 571,660 637,937  
Corporate Segment [Member]          
Segment Reporting [Line Items]          
Cost of services 0 0 0 0  
Gross profit 0 0 0 0  
Selling, general and administrative expenses 18,699 11,941 32,568 20,098  
Contingent consideration   0      
Loss (gain) on sale of assets 0 0 0 0  
Operating income (loss) (18,699) (11,941) (32,568) (20,098)  
Depreciation and amortization expense 351 226 665 453  
Capital expenditures 44 1,685 18,520 2,740  
Total assets 374,972 191,676 374,972 191,676  
Revenues $ 0 $ 0 $ 0 $ 0