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Operating Segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Revenues $ 2,166,808 $ 1,536,493 $ 1,190,856
Cost of services 1,847,878 1,248,495 962,897
Gross profit 318,930 287,998 227,959
Selling, general and administrative expenses 262,714 202,251 170,911
Goodwill impairment expense 0 0 6,976
Contingent consideration (277) (211) (11)
Loss (gain) on sale of assets 69 47 0
Operating income (loss) 56,008 85,583 50,083
Depreciation and amortization 25,468 21,914 12,508
Capital expenditures 29,255 7,401 4,745
Total assets 934,709 766,622 560,528
Communications [Member]      
Segment Reporting Information [Line Items]      
Revenues 559,777 445,968 395,141
Cost of services 490,959 361,197 317,013
Gross profit 68,818 84,771 78,128
Selling, general and administrative expenses 46,717 41,373 37,674
Contingent consideration 0 0 0
Loss (gain) on sale of assets (12) 4 (8)
Operating income (loss) 22,089 43,402 40,446
Depreciation and amortization 1,550 1,394 1,351
Capital expenditures 2,004 963 830
Total assets 210,875 164,699 154,808
Residential [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,131,414 687,347 411,790
Cost of services 928,161 553,546 318,034
Gross profit 203,253 133,801 93,756
Selling, general and administrative expenses 144,100 92,761 63,668
Contingent consideration (277) (211) 0
Loss (gain) on sale of assets (20) (86) (2)
Operating income (loss) 58,856 40,743 30,086
Depreciation and amortization 15,617 11,490 2,276
Capital expenditures 10,054 2,829 1,459
Total assets 394,757 329,691 110,998
Infrastructure Solutions [Member]      
Segment Reporting Information [Line Items]      
Revenues 167,113 146,980 128,379
Cost of services 138,444 106,048 93,358
Gross profit 28,669 40,932 35,021
Selling, general and administrative expenses 25,129 23,966 20,418
Contingent consideration 0 0 0
Loss (gain) on sale of assets 46 10 (35)
Operating income (loss) 3,586 16,976 14,568
Depreciation and amortization 5,575 6,170 6,020
Capital expenditures 14,729 2,067 795
Total assets 161,828 137,628 124,640
Commercial and Industrial [Member]      
Segment Reporting Information [Line Items]      
Revenues 308,504 256,198 255,546
Cost of services 290,314 227,704 234,492
Gross profit 18,190 28,494 21,054
Selling, general and administrative expenses 30,557 28,172 32,128
Goodwill impairment expense     6,976
Contingent consideration 0 0 (11)
Loss (gain) on sale of assets 55 92 45
Operating income (loss) (12,312) 414 (17,994)
Depreciation and amortization 2,561 2,709 2,768
Capital expenditures 1,890 1,453 1,362
Total assets 114,529 87,577 68,318
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 16,211 15,979 17,023
Contingent consideration 0 0 0
Loss (gain) on sale of assets 0 (27) 0
Operating income (loss) (16,211) (15,952) (17,023)
Depreciation and amortization 165 151 93
Capital expenditures 578 89 299
Total assets $ 52,720 $ 47,027 $ 101,764