Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Loss Contingencies [Line Items]
Revenues	$ 4,519,571	$ 4,283,758	$ 2,556,158
Product [Member]
Loss Contingencies [Line Items]
Revenues	1,293,795	1,279,164	954,126
Defense and Advanced Technologies [Member] | Positive Outcome of Litigation [Member] | Interest Income [Member]
Loss Contingencies [Line Items]
Revenues		7,200	6,400
Defense and Advanced Technologies [Member] | Positive Outcome of Litigation [Member] | Product [Member]
Loss Contingencies [Line Items]
Revenues	41,700	99,900	$ 55,800
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
U.S. government contract-related reserves	$ 14,800	$ 16,600