For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Related Parties - Narrative (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	Aug. 11, 2025	Jun. 28, 2026	Dec. 28, 2025	Nov. 30, 2021
Related Party Transaction [Line Items]
Accounts receivable, net		$ 391,924	$ 314,665
Contract assets		379,564	395,126
Contract liabilities		$ 66,799	50,510
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%
Southwest Gas Corporation \| Related Party
Related Party Transaction [Line Items]
Accounts receivable, net		$ 9,100	11,900
Contract assets		4,900	700
Contract liabilities		$ 0	$ 0
Southwest Gas Corporation \| Related Party \| Customer Concentration Risk \| Accounts Receivable
Related Party Transaction [Line Items]
Concentration risk percentage		2.00%	4.00%
Southwest Gas Holdings
Related Party Transaction [Line Items]
Percentage of ownership after sale of stock	31.00%