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Marketable Securities - Additional Information (Detail) - USD ($) $ in Millions | May 31, 2024 | May 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale debt securities current | $ 6.5 | $ 5.1
Available-for-sale debt securities long-term asset | 20.2 | 22.1
Equity securities | $ 127.6 | $ 121.2

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