v3.25.2
Revenue Recognition - Summary of Revenues (Detail) - Sales Revenue, Net [Member] - Revenue from Rights Concentration Risk [Member]
3 Months Ended 6 Months Ended
Jul. 04, 2025
Jun. 28, 2024
Jul. 04, 2025
Jun. 28, 2024
Time And Materials Contracts [Member]        
Disaggregation Of Revenue [Line Items]        
Concentration Risk, Percentage 80.00% 77.00% 80.00% 80.00%
Time And Materials Contracts [Member] | Engineering and Other Scientific [Member]        
Disaggregation Of Revenue [Line Items]        
Concentration Risk, Percentage 65.00% 62.00% 66.00% 64.00%
Time And Materials Contracts [Member] | Environmental and Health [Member]        
Disaggregation Of Revenue [Line Items]        
Concentration Risk, Percentage 15.00% 15.00% 14.00% 16.00%
Fixed Price Contracts [Member]        
Disaggregation Of Revenue [Line Items]        
Concentration Risk, Percentage 20.00% 23.00% 20.00% 20.00%
Fixed Price Contracts [Member] | Engineering and Other Scientific [Member]        
Disaggregation Of Revenue [Line Items]        
Concentration Risk, Percentage 19.00% 22.00% 19.00% 19.00%
Fixed Price Contracts [Member] | Environmental and Health [Member]        
Disaggregation Of Revenue [Line Items]        
Concentration Risk, Percentage 1.00% 1.00% 1.00% 1.00%