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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Loss Contingencies [Line Items]
Revenues	$ 1,122,262	$ 1,225,415	$ 2,248,722	$ 2,005,206
Product [Member]
Loss Contingencies [Line Items]
Revenues	323,948	401,729	629,687	638,101
Defense and Advanced Technologies [Member] | Positive Outcome Of Litigation [Member] | Interest Income [Member]
Loss Contingencies [Line Items]
Revenues		$ 7,200		$ 7,200
Defense and Advanced Technologies [Member] | Positive Outcome Of Litigation [Member] | Product [Member]
Loss Contingencies [Line Items]
Revenues	99,900		41,700
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
U.S. government contract-related reserves	$ 11,400		$ 11,400		$ 16,600

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