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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Segment Reporting Information [Line Items]          
Cost of services $ 467,955 $ 443,086 $ 947,391 $ 843,868  
Gross profit 100,926 58,507 196,364 138,234  
Selling, general and administrative expenses 69,349 63,430 137,117 122,832  
Contingent consideration 69 69 138 138  
Loss (gain) on sale of assets (102) (68) (13,162) (73)  
Operating income (loss) 31,610 (4,924) 72,271 15,337  
Depreciation and amortization expense 6,864 6,156 13,252 12,370  
Capital expenditures 3,965 9,288 6,677 21,627  
Total assets 889,088 831,239 889,088 831,239 $ 934,709
Revenues 568,881 501,593 1,143,755 982,102  
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Cost of services 62,296 74,034 118,949 134,412  
Gross profit 6,737 (5,219) 10,351 3,651  
Selling, general and administrative expenses 6,400 8,448 12,089 15,716  
Loss (gain) on sale of assets (99) (33) (13,134) (40)  
Operating income (loss) 436 (13,634) 11,396 (12,025)  
Depreciation and amortization expense 412 647 804 1,277  
Capital expenditures 546 840 1,269 1,085  
Total assets 87,721 99,262 87,721 99,262  
Revenues 69,033 68,815 129,300 138,063  
Communications [Member]          
Segment Reporting Information [Line Items]          
Cost of services 115,957 119,518 241,464 226,408  
Gross profit 25,163 11,121 46,901 31,620  
Selling, general and administrative expenses 13,386 10,978 25,683 22,363  
Loss (gain) on sale of assets (3) (7) (3) (13)  
Operating income (loss) 11,780 150 21,221 9,270  
Depreciation and amortization expense 502 362 932 721  
Capital expenditures 480 750 1,122 1,344  
Total assets 188,937 171,929 188,937 171,929  
Revenues 141,120 130,639 288,365 258,028  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Cost of services 38,421 34,672 77,238 69,048  
Gross profit 14,195 7,061 24,662 14,781  
Selling, general and administrative expenses 5,990 6,391 11,751 12,449  
Contingent consideration   0      
Loss (gain) on sale of assets 0 (28) (19) (28)  
Operating income (loss) 8,205 698 12,930 2,360  
Depreciation and amortization expense 1,326 1,385 2,680 2,728  
Capital expenditures 560 823 1,199 11,139  
Total assets 173,621 150,276 173,621 150,276  
Revenues 52,616 41,733 101,900 83,829  
Residential [Member]          
Segment Reporting Information [Line Items]          
Cost of services 251,281 214,862 509,740 414,000  
Gross profit 54,831 45,544 114,450 88,182  
Selling, general and administrative expenses 37,999 33,576 77,050 64,571  
Contingent consideration 69 69 138 138  
Loss (gain) on sale of assets 0 0 (6) 8  
Operating income (loss) 16,763 11,899 37,268 23,465  
Depreciation and amortization expense 4,557 3,721 8,701 7,573  
Capital expenditures 2,379 6,707 3,087 7,891  
Total assets 389,946 363,921 389,946 363,921  
Revenues 306,112 260,406 624,190 502,182  
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 5,574 4,037 10,544 7,733  
Contingent consideration   0      
Loss (gain) on sale of assets 0 0 0 0  
Operating income (loss) (5,574) (4,037) (10,544) (7,733)  
Depreciation and amortization expense 67 41 135 71  
Capital expenditures 0 168 0 168  
Total assets 48,863 45,851 48,863 45,851  
Revenues $ 0 $ 0 $ 0 $ 0