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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Revenue Recognition and Deferred Revenue [Abstract]
Unbilled Receivables, Current	$ 13,639		$ 13,639
Costs and estimated earnings in excess of billings	74,744		74,744		$ 60,139
Billings in excess of costs and estimated earnings	(154,803)		(154,803)		$ (158,972)
Contract with Customer, Liability, Revenue Recognized			145,991	$ 96,889
Performance Obligation Next 12 Months	940,247		940,247
Revenue, Remaining Performance Obligation, Amount	1,295,207		1,295,207
Disaggregation of Revenue [Line Items]
Revenues	890,158	$ 768,415	2,473,665	2,108,592
Contract with Customer, Liability, Revenue Recognized			145,991	96,889
Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	115,419	96,554	329,268	278,575
Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	299,213	192,303	805,189	556,554
Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	129,488	102,022	355,233	240,699
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	346,038	377,536	983,975	1,032,764
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	779,467	677,750	2,177,445	1,890,650
Fixed-price Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	102,855	75,540	287,474	232,422
Fixed-price Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	211,644	131,536	580,389	397,903
Fixed-price Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	118,930	93,138	325,607	227,561
Fixed-price Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	346,038	377,536	983,975	1,032,764
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	110,691	90,665	296,220	217,942
Time-and-materials Contract [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	12,564	21,014	41,794	46,153
Time-and-materials Contract [Member] | Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	87,569	60,767	224,800	158,651
Time-and-materials Contract [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	10,558	8,884	29,626	13,138
Time-and-materials Contract [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
industrial Services [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	23,708	11,786	71,553	34,960
Custom Power Solutions [Member] | Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	105,780	90,236	283,680	205,739
Single Family Contracts [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	171,792	195,677	501,074	540,265
Multi Family and Other [Member] | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	87,917	92,325	243,221	248,694
Single Family Contracts Plumbing HVAC | Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 86,329	$ 89,534	$ 239,680	$ 243,805

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