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Revenue Recognition - Summary of Revenues (Detail) - Sales Revenue, Net [Member] - Revenue from Rights Concentration Risk [Member]	3 Months Ended
	Apr. 03, 2026	Apr. 04, 2025
Time And Materials Contracts [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	77.00%	82.00%
Time And Materials Contracts [Member] | Engineering & Other Scientific [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	62.00%	66.00%
Time And Materials Contracts [Member] | Environmental and Health [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	15.00%	16.00%
Fixed Price Contracts [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	23.00%	18.00%
Fixed Price Contracts [Member] | Engineering & Other Scientific [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	22.00%	17.00%
Fixed Price Contracts [Member] | Environmental and Health [Member]
Disaggregation Of Revenue [Line Items]
Concentration Risk, Percentage	1.00%	1.00%

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- Definition

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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