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Revenue - Revenue by Contract Relationship (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2022
Apr. 02, 2021
Disaggregation of Revenue [Line Items]    
Total revenue $ 456,471 $ 434,004
Prime contractor    
Disaggregation of Revenue [Line Items]    
Total revenue $ 427,093 403,262
Revenue, percent change 5.90%  
Subcontractor    
Disaggregation of Revenue [Line Items]    
Total revenue $ 29,378 $ 30,742
Revenue, percent change (4.40%)