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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 2,277,074	$ 2,030,520	$ 6,825,650	$ 6,125,624
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 Type 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	$ 2,151,265	$ 1,913,657	$ 6,461,935	$ 5,753,596
Prime Contractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	94.00%	94.00%	95.00%	94.00%
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 125,809	$ 116,863	$ 363,715	$ 372,028
Subcontractor | Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	6.00%	6.00%	5.00%	6.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 2,221,235	$ 1,966,536	$ 6,643,256	$ 5,967,127
Total U.S. government | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	97.00%	97.00%	97.00%	97.00%
Defense Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 1,043,535	$ 946,141	$ 3,082,634	$ 2,916,210
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%	47.00%	45.00%	48.00%
Intelligence Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 419,227	$ 369,345	$ 1,260,653	$ 1,144,933
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%	18.00%	18.00%
Civil Clients | Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 758,473	$ 651,050	$ 2,299,969	$ 1,905,984
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)	33.00%	32.00%	34.00%	31.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 55,839	$ 63,984	$ 182,394	$ 158,497
Global Commercial Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	3.00%	3.00%	3.00%	3.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,211,589	$ 1,079,893	$ 3,603,824	$ 3,322,507
Cost-reimbursable | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	53.00%	53.00%	53.00%	54.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 572,491	$ 484,718	$ 1,682,831	$ 1,482,431
Time-and-materials | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	25.00%	24.00%	25.00%	24.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 492,994	$ 465,909	$ 1,538,995	$ 1,320,686
Fixed-price | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	22.00%	23.00%	22.00%	22.00%

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