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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 2,666,282	$ 2,298,976	$ 5,320,768	$ 4,548,576
Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	100.00%	100.00%	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%	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%	100.00%	100.00%
Prime Contractor
Disaggregation of Revenue [Line Items]
Revenue	$ 2,537,085	$ 2,179,375	$ 5,054,643	$ 4,310,670
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%	95.00%	95.00%
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 129,197	$ 119,601	$ 266,125	$ 237,906
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	5.00%	5.00%	5.00%	5.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 2,631,186	$ 2,235,428	$ 5,236,960	$ 4,422,022
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	99.00%	97.00%	98.00%	97.00%
Defense Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 1,270,135	$ 1,028,275	$ 2,494,452	$ 2,056,086
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)	48.00%	45.00%	47.00%	45.00%
Intelligence Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 444,982	$ 425,874	$ 921,479	$ 829,997
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)	17.00%	18.00%	17.00%	18.00%
Civil Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 916,069	$ 781,279	$ 1,821,029	$ 1,535,939
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%	34.00%	34.00%	34.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 35,096	$ 63,548	$ 83,808	$ 126,554
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	1.00%	3.00%	2.00%	3.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,463,949	$ 1,201,407	$ 2,914,133	$ 2,392,235
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	55.00%	52.00%	55.00%	53.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 638,607	$ 564,438	$ 1,274,340	$ 1,110,340
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	24.00%	25.00%	24.00%	24.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 563,726	$ 533,131	$ 1,132,295	$ 1,046,001
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%	21.00%	23.00%

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