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Operating Segments (Tables)
6 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Three Months Ended March 31, 2022
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$130,639 $260,406 $41,733 $68,815 $— $501,593 
Cost of services119,518 214,862 34,672 74,034 — 443,086 
Gross profit (loss)11,121 45,544 7,061 (5,219)— 58,507 
Selling, general and administrative10,978 33,576 6,391 8,448 4,037 63,430 
Contingent consideration— 69 — — — 69 
Gain on sale of assets(7)— (28)(33)— (68)
Operating income (loss)$150 $11,899 $698 $(13,634)$(4,037)$(4,924)
 Other data:
Depreciation and amortization expense$362 $3,721 $1,385 $647 $41 $6,156 
Capital expenditures$750 $6,707 $823 $840 $168 $9,288 
Total assets$171,929 $363,921 $150,276 $99,262 $45,851 $831,239 
Three Months Ended March 31, 2021
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$94,886 $150,336 $34,716 $52,023 $— $331,961 
Cost of services75,339 120,146 25,161 46,441 — 267,087 
Gross profit19,547 30,190 9,555 5,582 — 64,874 
Selling, general and administrative9,615 21,609 6,242 6,744 3,445 47,655 
Contingent consideration— 73 — — — 73 
Loss (gain) on sale of assets— 52 (26)(8)— 18 
Operating income (loss)$9,932 $8,456 $3,339 $(1,154)$(3,445)$17,128 
Other data:
Depreciation and amortization expense$347 $3,205 $1,554 $683 $39 $5,828 
Capital expenditures$133 $1,040 $163 $397 $89 $1,822 
Total assets$128,568 $215,399 $134,037 $69,405 $68,243 $615,652 
Six Months Ended March 31, 2022
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$258,028 $502,182 $83,829 $138,063 $— $982,102 
Cost of services226,408 414,000 69,048 134,412 — 843,868 
Gross profit31,620 88,182 14,781 3,651 — 138,234 
Selling, general and administrative22,363 64,571 12,449 15,716 7,733 122,832 
Contingent consideration— 138 — — — 138 
Loss (gain) on sale of assets(13)(28)(40)— (73)
Operating income (loss)$9,270 $23,465 $2,360 $(12,025)$(7,733)$15,337 
Other data:
Depreciation and amortization expense$721 $7,573 $2,728 $1,277 $71 $12,370 
Capital expenditures$1,344 $7,891 $11,139 $1,085 $168 $21,627 
Total assets$171,929 $363,921 $150,276 $99,262 $45,851 $831,239 
Six Months Ended March 31, 2021
CommunicationsResidentialInfrastructure SolutionsCommercial & IndustrialCorporateTotal
Revenues$193,242 $269,827 $69,117 $114,613 $— $646,799 
Cost of services155,156 216,109 48,625 103,356 — 523,246 
Gross profit38,086 53,718 20,492 11,257 — 123,553 
Selling, general and administrative18,956 38,936 11,853 13,168 7,528 90,441 
Contingent consideration— 73 — — — 73 
Loss (gain) on sale of assets— 52 (27)(17)— 
Operating income (loss)$19,130 $14,657 $8,666 $(1,894)$(7,528)$33,031 
Other data:
Depreciation and amortization expense$694 $4,709 $2,995 $1,377 $73 $9,848 
Capital expenditures$265 $1,477 $508 $665 $89 $3,004 
Total assets$128,568 $215,399 $134,037 $69,405 $68,243 $615,652