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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 11,980	$ 10,662	$ 9,259
Prime Contractor
Disaggregation of Revenue [Line Items]
Revenue	11,397	10,143	8,756
Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	583	519	503
Defense Customers
Disaggregation of Revenue [Line Items]
Revenue	5,943	5,061	4,230
Intelligence Customers
Disaggregation of Revenue [Line Items]
Revenue	1,867	1,763	1,684
Civil Customers
Disaggregation of Revenue [Line Items]
Revenue	$ 4,170	$ 3,838	$ 3,345
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%
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%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Defense Customers
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	49.00%	47.00%	46.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Intelligence Customers
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	16.00%	17.00%	18.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Civil Customers
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	35.00%	36.00%	36.00%
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%
Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk | Prime Contractor
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	95.00%	95.00%	95.00%
Revenue from Contract with Customer Benchmark | Contractor Concentration Type Risk | Subcontractor
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	5.00%	5.00%	5.00%
Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	$ 6,865	$ 5,874	$ 4,909
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%	53.00%
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	$ 2,707	$ 2,530	$ 2,297
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%	25.00%
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	$ 2,408	$ 2,258	$ 2,053
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%	22.00%

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