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Related Parties - Narrative (Details) - USD ($) $ in Thousands				12 Months Ended
	Aug. 11, 2025	Jul. 08, 2025	Apr. 22, 2024	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023	Nov. 30, 2021
Related Party Transaction [Line Items]
Accounts receivable, net				$ 314,665	$ 281,441
Contract assets				395,126	238,169	$ 269,808
Contract liabilities				50,510	24,975	43,694
Selling, general and administrative expenses				126,464	107,247	110,344
Total revenue				$ 2,982,781	2,637,229	2,899,276
Drum Parent LLC \| Members Of Management Of Riggs Distler & Company, Inc.
Related Party Transaction [Line Items]
Percentage owned by noncontrolling owner							1.42%
Drum Parent LLC \| Employees Of Riggs Distler & Company, Inc.
Related Party Transaction [Line Items]
Percentage owned by noncontrolling owner				0.80%
Related Party
Related Party Transaction [Line Items]
Accounts receivable, net				$ 11,852	9,648
Contract assets				657	2,623
Selling, general and administrative expenses					500	1,300
Taxes payable				0	600
Total revenue				97,588	106,835	$ 116,431
Chief Executive Officer and Member of Board
Related Party Transaction [Line Items]
Accounts receivable, net					26,500
Contract assets					26,000
Contract liabilities					0
Total revenue					$ 143,700
Chief Executive Officer and Member of Board \| Contract Assets \| Customer Concentration Risk
Related Party Transaction [Line Items]
Concentration risk percentage					11.00%
Southwest Gas Corporation \| Related Party
Related Party Transaction [Line Items]
Accounts receivable, net				11,900	$ 9,600
Contract assets				700	2,600
Contract liabilities				$ 0	$ 0
Southwest Gas Corporation \| Related Party \| Accounts Receivable \| Customer Concentration Risk
Related Party Transaction [Line Items]
Concentration risk percentage				4.00%	3.00%
Southwest Gas Holdings
Related Party Transaction [Line Items]
Percentage of ownership after sale of stock	31.00%	52.00%	81.00%