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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue Recognition and Deferred Revenue [Abstract]
Capitalized Contract Cost, Net	$ 86								$ 86
Unbilled Receivables, Current	11,329								11,329
Estimated profits on contracts in process	761,401				$ 539,226				761,401	$ 539,226
Billings to Date	(772,104)				(541,606)				(772,104)	(541,606)
Contract with Customer, Asset, Net, Current	(10,703)				(2,380)				(10,703)	(2,380)
Costs in Excess of Billings, Current	29,860				31,446				29,860	31,446
Billings in Excess of Cost, Current	(40,563)				(33,826)				(40,563)	(33,826)
Contract with Customer, Liability, Revenue Recognized									31,831	31,135
Revenue, Remaining Performance Obligation, Amount	451,884								451,884
Performance Obligation Next 12 Months	391,769								391,769
Disaggregation of Revenue [Line Items]
Revenues	$ 293,607	$ 282,633	$ 256,914	$ 243,842	$ 240,275	$ 232,576	$ 205,677	$ 198,300	1,076,996	876,828	$ 810,744
Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues									305,624	274,299	227,606
Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues									321,246	219,655	225,275
Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									136,790	97,163	83,824
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues									313,336	285,711	274,039
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues									957,894	786,588	732,043
Fixed-price Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues									286,319	244,464	206,850
Fixed-price Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues									229,143	166,258	174,922
Fixed-price Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									129,096	90,155	76,232
Fixed-price Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues									313,336	285,711	274,039
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues									119,102	90,240	78,701
Time-and-materials Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues									19,305	29,835	20,756
Time-and-materials Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues									92,103	53,397	50,353
Time-and-materials Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									7,694	7,008	7,592
Time-and-materials Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
industrial Services [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									48,948	44,701	46,079
Custom Power Solutions [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues									87,842	52,462	37,745
Single Family Contracts [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues									212,358	190,379	162,100
Multi Family and Other [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 100,978	$ 95,332	$ 111,939

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