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Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 2,166,808	$ 1,536,493	$ 1,190,856
Unbilled Receivables, Current	19,296
Contract with Customer, Liability, Revenue Recognized	52,683	47,906
Performance Obligation Next 12 Months	776,897
Revenue, Remaining Performance Obligation, Amount	967,000
Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	559,777	445,968	395,141
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,131,414	687,347	411,790
Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	167,113	146,980	128,379
Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	308,504	256,198	255,546
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,941,443	1,397,921	1,085,143
Fixed-price Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	367,513	327,496	309,567
Fixed-price Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,131,414	687,347	411,790
Fixed-price Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	159,994	139,532	121,922
Fixed-price Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	282,522	243,546	241,864
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	225,365	138,572	105,713
Time-and-materials Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	192,264	118,472	85,574
Time-and-materials Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Time-and-materials Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,119	7,448	6,457
Time-and-materials Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	25,982	12,652	13,682
industrial Services [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	65,686	44,427	40,701
Custom Power Solutions [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	101,427	102,553	87,678
Single Family Contracts [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	825,505	454,449	239,140
Multi Family and Other [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 305,909	$ 232,898	$ 172,650

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