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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 2,569,801	$ 2,277,074	$ 7,890,569	$ 6,825,650
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	$ 2,447,401	$ 2,151,265	$ 7,502,044	$ 6,461,935
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	95.00%	94.00%	95.00%	95.00%
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 122,400	$ 125,809	$ 388,525	$ 363,715
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	5.00%	6.00%	5.00%	5.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 2,526,221	$ 2,221,234	$ 7,763,181	$ 6,643,256
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%	98.00%	97.00%
Defense Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 1,224,561	$ 1,046,441	$ 3,719,013	$ 3,102,528
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)	47.00%	46.00%	47.00%	45.00%
Intelligence Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 408,458	$ 418,783	$ 1,329,937	$ 1,248,779
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)	16.00%	18.00%	17.00%	18.00%
Civil Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 893,202	$ 756,010	$ 2,714,231	$ 2,291,949
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)	35.00%	33.00%	34.00%	34.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 43,580	$ 55,840	$ 127,388	$ 182,394
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%	2.00%	3.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,403,297	$ 1,211,589	$ 4,317,430	$ 3,603,824
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%	55.00%	53.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 614,339	$ 572,491	$ 1,888,679	$ 1,682,831
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%	25.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 552,165	$ 492,994	$ 1,684,460	$ 1,538,995
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	21.00%	22.00%	21.00%	22.00%

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