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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 9,258,911	$ 8,363,700	$ 7,858,938
Revenue (as a percent)	100.00%	100.00%	100.00%
Prime Contractor
Disaggregation of Revenue [Line Items]
Revenue	$ 8,755,628	$ 7,864,273	$ 7,311,313
Revenue (as a percent)	95.00%	94.00%	93.00%
Sub-contractor
Disaggregation of Revenue [Line Items]
Revenue	$ 503,283	$ 499,427	$ 547,625
Revenue (as a percent)	5.00%	6.00%	7.00%
Global Commercial Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 229,650	$ 216,280	$ 205,834
Revenue (as a percent)	3.00%	3.00%	3.00%
Total U.S. government
Disaggregation of Revenue [Line Items]
Revenue	$ 9,029,261	$ 8,147,420	$ 7,653,104
Revenue (as a percent)	97.00%	97.00%	97.00%
Total U.S. government | Defense Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 4,210,430	$ 3,950,751	$ 3,920,498
Revenue (as a percent)	45.00%	47.00%	49.00%
Total U.S. government | Intelligence Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 1,693,942	$ 1,578,939	$ 1,549,422
Revenue (as a percent)	18.00%	19.00%	20.00%
Total U.S. government | Civil Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 3,124,889	$ 2,617,730	$ 2,183,184
Revenue (as a percent)	34.00%	31.00%	28.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 4,908,451	$ 4,514,262	$ 4,419,533
Revenue (as a percent)	53.00%	54.00%	56.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 2,296,965	$ 2,017,094	$ 1,962,999
Revenue (as a percent)	25.00%	24.00%	25.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 2,053,495	$ 1,832,344	$ 1,476,406
Revenue (as a percent)	22.00%	22.00%	19.00%

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