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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 3,146,386	$ 2,666,282	$ 6,088,183	$ 5,320,768
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	$ 3,001,344	$ 2,537,085	$ 5,809,029	$ 5,054,643
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	$ 145,042	$ 129,197	$ 279,154	$ 266,125
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	$ 1,544,108	$ 1,270,943	$ 2,960,978	$ 2,492,638
Defense Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	49.00%	47.00%	48.00%	47.00%
Intelligence Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 496,420	$ 442,924	$ 957,459	$ 920,456
Intelligence Clients | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	16.00%	17.00%	16.00%	17.00%
Civil Clients
Disaggregation of Revenue [Line Items]
Revenue	$ 1,105,858	$ 952,415	$ 2,169,746	$ 1,907,674
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%	36.00%	36.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 1,781,044	$ 1,463,949	$ 3,440,967	$ 2,914,133
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%	56.00%	55.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 722,818	$ 638,607	$ 1,393,386	$ 1,274,340
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	$ 642,524	$ 563,726	$ 1,253,830	$ 1,132,295
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%	21.00%	21.00%

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