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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Revenue Recognition and Deferred Revenue [Abstract]
Unbilled Receivables, Current	$ 20,767
Costs and estimated earnings in excess of billings	52,529		$ 43,389
Billings in excess of costs and estimated earnings	(66,242)		$ (62,486)
Contract with Customer, Liability, Revenue Recognized	28,341	$ 25,225
Performance Obligation Next 12 Months	653,218
Revenue, Remaining Performance Obligation, Amount	721,126
Disaggregation of Revenue [Line Items]
Revenues	480,509	314,838
Contract with Customer, Liability, Revenue Recognized	28,341	25,225
Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	69,248	62,590
Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	127,389	98,356
Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	42,096	34,401
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	241,776	119,491
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	435,511	288,856
Fixed-price Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	64,860	60,687
Fixed-price Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	88,422	76,014
Fixed-price Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	40,453	32,664
Fixed-price Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	241,776	119,491
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	44,998	25,982
Time-and-materials Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	4,388	1,903
Time-and-materials Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	38,967	22,342
Time-and-materials Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,643	1,737
Time-and-materials Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0
industrial Services [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	14,816	10,040
Custom Power Solutions [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	27,280	24,361
Single Family Contracts [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	173,528	72,126
Multi Family and Other [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 68,248	$ 47,365

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