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Marketable Securities - Additional Information (Detail) - USD ($) $ in Millions | May 31, 2025 | May 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale debt securities current | $ 4.1 | $ 6.5
Available-for-sale debt securities long-term asset | 20.2 | 20.2
Equity securities | $ 135.4 | $ 127.6

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