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Operating Segments
 12 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Segment Reporting Disclosure [Text Block]
11. OPERATING SEGMENTS

We manage and measure performance of our business in four distinct operating segments: Communications, Residential, Infrastructure Solutions and Commercial & Industrial. These segments are reflective of how the Company’s CODM reviews operating results for the purposes of allocating resources and assessing performance. The CODM primarily uses “Income (loss) from operations” for each operating segment to assess performance and decide how to allocate resources. Investment gains and losses and certain other corporate income and expense items are not considered in assessing the financial performance of operating businesses. In evaluating performance of the operating businesses, the CODM may compare actual income from operations for a segment to its forecast or prior year results. The Company’s CODM is its Chief Executive Officer.

Transactions between segments, if any, are eliminated in consolidation. Our corporate office provides general and administrative services, as well as support services, to our four operating segments. Management allocates certain shared costs among segments for selling, general and administrative expenses and depreciation expense.

Segment information for the years ended September 30, 2025, 2024 and 2023 is as follows:

Year Ended September 30, 2025
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$1,140,640 $1,304,369 $498,724 $427,735 $— $3,371,468 
Cost of services876,037 967,920 327,202 340,812 — 2,511,971 
Gross profit264,603 336,449 171,522 86,923 — 859,497 
Selling, general and administrative98,187 232,789 51,813 39,695 52,494 474,978 
Contingent consideration— — 1,145 — — 1,145 
Loss (gain) on sale of assets(89)(132)97 (31)— (155)
Income (loss) from operations$166,505 $103,792 $118,467 $47,259 $(52,494)$383,529 
Other data:
Depreciation and amortization expense$5,481 $23,320 $14,420 $2,792 $928 $46,941 
Capital expenditures$27,899 $11,351 $12,046 $11,300 $4,657 $67,253 
Total assets$439,919 $356,539 $355,087 $113,123 $330,993 $1,595,661 

Year Ended September 30, 2024
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$776,474 $1,388,840 $351,096 $367,948 $— $2,884,358 
Cost of services623,844 1,024,440 245,743 293,741 — 2,187,768 
Gross profit152,630 364,400 105,353 74,207 — 696,590 
Selling, general and administrative65,752 228,371 37,394 32,925 32,242 396,684 
Contingent consideration— 36 678 — — 714 
Gain on sale of assets(18)(1,354)(184)(114)(14)(1,684)
Income (loss) from operations$86,896 $137,347 $67,465 $41,396 $(32,228)$300,876 
Other data:
Depreciation and amortization expense$3,627 $20,752 $9,783 $2,028 $913 $37,103 
Capital expenditures$13,493 $15,620 $8,916 $5,205 $1,925 $45,159 
Total assets$285,478 $395,682 $288,765 $89,023 $185,078 $1,244,026 
Year Ended September 30, 2023
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$600,776 $1,279,504 $217,353 $279,594 $— $2,377,227 
Cost of services494,964 1,026,524 162,905 248,295 — 1,932,688 
Gross profit105,812 252,980 54,448 31,299 — 444,539 
Selling, general and administrative54,344 169,737 26,260 25,225 23,059 298,625 
Contingent consideration— 277 — — — 277 
Loss (gain) on sale of assets12 69 (1,029)(13,198)7 (14,139)
Income (loss) from operations$51,456 $82,897 $29,217 $19,272 $(23,066)$159,776 
Other data:
Depreciation and amortization expense$2,215 $19,281 $5,198 $1,640 $1,073 $29,407 
Capital expenditures$2,203 $9,114 $2,767 $2,525 $1,058 $17,667 
Total assets$205,924 $386,829 $180,871 $87,677 $120,299 $981,600