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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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