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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]    
Revenue $ 2,941,797 $ 2,654,486
Revenue from Contract with Customer Benchmark | Product Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 100.00% 100.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 100.00% 100.00%
Revenue from Contract with Customer Benchmark | Contractor Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 100.00% 100.00%
Prime Contractor    
Disaggregation of Revenue [Line Items]    
Revenue $ 2,807,685 $ 2,517,558
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 95.00% 95.00%
Subcontractor    
Disaggregation of Revenue [Line Items]    
Revenue $ 134,112 $ 136,928
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 5.00% 5.00%
Defense Clients    
Disaggregation of Revenue [Line Items]    
Revenue $ 1,416,870 $ 1,224,317
Defense Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 48.00% 46.00%
Intelligence Clients    
Disaggregation of Revenue [Line Items]    
Revenue $ 461,039 $ 476,497
Intelligence Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 16.00% 18.00%
Civil Clients    
Disaggregation of Revenue [Line Items]    
Revenue $ 1,063,888 $ 953,672
Civil Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 36.00% 36.00%
Cost-reimbursable    
Disaggregation of Revenue [Line Items]    
Revenue $ 1,659,923 $ 1,450,184
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 56.00% 55.00%
Time-and-materials    
Disaggregation of Revenue [Line Items]    
Revenue $ 670,568 $ 635,733
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 23.00% 24.00%
Fixed-price    
Disaggregation of Revenue [Line Items]    
Revenue $ 611,306 $ 568,569
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk    
Disaggregation of Revenue [Line Items]    
Concentration risk (as a percent) 21.00% 21.00%