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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 2,654,486	$ 2,249,600
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	$ 2,517,558	$ 2,131,295
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	$ 136,928	$ 118,305
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	5.00%	5.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 2,605,774	$ 2,186,594
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	98.00%	97.00%
Defense Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 1,224,317	$ 1,027,811
Defense Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	46.00%	46.00%
Intelligence Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 476,497	$ 404,123
Intelligence Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	18.00%	18.00%
Civil Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 904,960	$ 754,660
Civil Clients | Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	34.00%	33.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 48,712	$ 63,006
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	2.00%	3.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,450,184	$ 1,190,828
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	55.00%	53.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 635,733	$ 545,902
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	24.00%	24.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 568,569	$ 512,870
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	21.00%	23.00%

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