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REVENUE - Revenue by Contract Type (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2026
Jun. 27, 2025
Jul. 03, 2026
Jun. 27, 2025
Disaggregation of Revenue [Line Items]        
Total revenue $ 1,256,643 $ 1,078,330 $ 2,510,771 $ 2,094,253
Cost-plus and cost-reimbursable        
Disaggregation of Revenue [Line Items]        
Total revenue $ 735,218 647,582 $ 1,487,623 1,270,653
Revenue, percent change 13.50%   17.10%  
Firm-fixed-price        
Disaggregation of Revenue [Line Items]        
Total revenue $ 389,650 405,091 $ 762,409 769,177
Revenue, percent change (3.80%)   (0.90%)  
Time-and-materials        
Disaggregation of Revenue [Line Items]        
Total revenue $ 131,775 $ 25,657 $ 260,739 $ 54,423
Revenue, percent change 413.60%   379.10%