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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 2,917,190	$ 2,569,801	$ 9,005,373	$ 7,890,569
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	$ 2,775,505	$ 2,447,401	$ 8,584,534	$ 7,502,044
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	$ 141,685	$ 122,400	$ 420,839	$ 388,525
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%
Defense Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 1,454,686	$ 1,225,697	$ 4,415,664	$ 3,718,335
Defense Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	50.00%	48.00%	49.00%	47.00%
Intelligence Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 451,187	$ 405,885	$ 1,408,646	$ 1,326,342
Intelligence Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	15.00%	16.00%	16.00%	17.00%
Civil Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 1,011,317	$ 938,219	$ 3,181,063	$ 2,845,892
Civil Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	35.00%	36.00%	35.00%	36.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,673,838	$ 1,403,297	$ 5,114,805	$ 4,317,430
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	57.00%	55.00%	57.00%	55.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 660,031	$ 614,339	$ 2,053,417	$ 1,888,679
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%	23.00%	24.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 583,321	$ 552,165	$ 1,837,151	$ 1,684,460
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	20.00%	21.00%	20.00%	21.00%

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