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Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Segment Reporting Information [Line Items]          
Cost of services $ 476,842 $ 484,501 $ 1,424,233 $ 1,328,369  
Gross profit 107,609 82,800 303,973 221,034  
Selling, general and administrative expenses 74,300 67,090 211,417 189,922  
Contingent consideration 70 70 208 208  
Loss (gain) on sale of assets (1,080) 3 (14,242) (70)  
Operating income (loss) 34,319 15,637 106,590 30,974  
Depreciation and amortization expense 6,878 6,372 20,130 18,742  
Capital expenditures 4,609 4,982 11,286 26,609  
Total assets 899,728 884,392 899,728 884,392 $ 934,709
Revenues 584,451 567,301 1,728,206 1,549,403  
Commercial and Industrial [Member]          
Segment Reporting Information [Line Items]          
Cost of services 58,872 72,895 177,821 207,307  
Gross profit 8,896 8,058 19,247 11,709  
Selling, general and administrative expenses 6,284 7,788 18,373 23,504  
Loss (gain) on sale of assets (13) (2) (13,147) (42)  
Operating income (loss) 2,625 272 14,021 (11,753)  
Depreciation and amortization expense 402 645 1,206 1,922  
Capital expenditures 800 372 2,069 1,457  
Total assets 84,101 111,782 84,101 111,782  
Revenues 67,768 80,953 197,068 219,016  
Communications [Member]          
Segment Reporting Information [Line Items]          
Cost of services 114,440 128,952 355,904 355,360  
Gross profit 27,175 15,796 74,076 47,416  
Selling, general and administrative expenses 13,680 11,544 39,363 33,907  
Loss (gain) on sale of assets (1) (1) (4) (14)  
Operating income (loss) 13,496 4,253 34,717 13,523  
Depreciation and amortization expense 498 394 1,430 1,115  
Capital expenditures 261 424 1,383 1,768  
Total assets 182,117 196,520 182,117 196,520  
Revenues 141,615 144,748 429,980 402,776  
Infrastructure Solutions [Member]          
Segment Reporting Information [Line Items]          
Cost of services 42,851 33,726 120,089 102,774  
Gross profit 14,206 6,111 38,868 20,892  
Selling, general and administrative expenses 7,066 6,484 18,817 18,933  
Contingent consideration   0      
Loss (gain) on sale of assets (1,010) 0 (1,029) (28)  
Operating income (loss) 8,150 (373) 21,080 1,987  
Depreciation and amortization expense 1,300 1,427 3,980 4,155  
Capital expenditures 918 3,071 2,117 14,210  
Total assets 179,363 152,405 179,363 152,405  
Revenues 57,057 39,837 158,957 123,666  
Residential [Member]          
Segment Reporting Information [Line Items]          
Cost of services 260,679 248,928 770,419 662,928  
Gross profit 57,332 52,835 171,782 141,017  
Selling, general and administrative expenses 41,939 37,237 118,989 101,808  
Contingent consideration 70 70 208 208  
Loss (gain) on sale of assets (56) 6 (62) 14  
Operating income (loss) 15,379 15,522 52,647 38,987  
Depreciation and amortization expense 4,609 3,863 13,310 11,436  
Capital expenditures 2,461 1,115 5,548 9,006  
Total assets 381,840 376,328 381,840 376,328  
Revenues 318,011 301,763 942,201 803,945  
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 5,331 4,037 15,875 11,770  
Contingent consideration   0      
Loss (gain) on sale of assets 0 0 0 0  
Operating income (loss) (5,331) (4,037) (15,875) (11,770)  
Depreciation and amortization expense 69 43 204 114  
Capital expenditures 169 0 169 168  
Total assets 72,307 47,357 72,307 47,357  
Revenues $ 0 $ 0 $ 0 $ 0