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Commitments and Contingencies (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 21, 2023	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2023
Concentration Risk [Line Items]
Operating income (loss)		$ 1,013,403	$ 446,848	$ 685,181
Net income		$ 605,706	$ 271,791	$ 466,740
Basic (in dollars per share)		$ 4.61	$ 2.04	$ 3.46
Diluted (in dollars per share)		$ 4.59	$ 2.03	$ 3.44
Claimed Indirect Costs
Concentration Risk [Line Items]
Decrease in reserve		$ 18,300
Claimed Indirect Costs | Unfavorable Regulatory Action
Concentration Risk [Line Items]
Provision for claimed indirect costs		363,700	$ 326,700
Claimed Indirect Costs | Revision of Prior Period, Adjustment
Concentration Risk [Line Items]
Operating income (loss)		18,300
Net income		$ 13,500
Basic (in dollars per share)		$ 0.10
Diluted (in dollars per share)		$ 0.10
U.S. Department of Justice
Concentration Risk [Line Items]
Estimate of possible loss			$ 350,000		$ 377,500
U.S. Department of Justice | Minimum
Concentration Risk [Line Items]
Estimate of possible loss					350,000
U.S. Department of Justice | Maximum
Concentration Risk [Line Items]
Estimate of possible loss					$ 378,000
U.S. Department of Justice | Unfavorable Regulatory Action
Concentration Risk [Line Items]
Amount awarded to other party	$ 377,500
Total U.S. government | Revenue Benchmark | Contracts with U.S. Government Agencies or Other U.S. Government Contractors
Concentration Risk [Line Items]
Concentration risk (as a percent)		98.00%	97.00%	97.00%
Financial Standby Letter of Credit
Concentration Risk [Line Items]
Guarantor obligations, carrying value		$ 4,400	$ 6,100
Guarantor obligations, reduction to available borrowings		1,300
Guarantor obligations, facility		7,500
Guarantor obligations, available amount		$ 4,400	$ 2,700

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