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Marketable Securities - Summary of Available-for-Sale Debt Securities in Unrealized Loss Position and Included in Accumulated Other Comprehensive (Loss), Aggregated by Length of Time Investments (Detail) - USD ($) $ in Thousands | May 31, 2025 | May 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Total investments with unrealized losses, fair value | $ 15,794 | $ 25,464
Unrealized losses with a loss position for less than 12 months, fair value | 5,777 | 4,866
Unrealized losses with a loss position for more than 12 months, fair value | 10,017 | 20,598
Total investments with unrealized losses, gross unrealized losses | (1,100) | (1,796)
Unrealized losses with a loss position for less than 12 months, gross unrealized losses | (753) | (36)
Unrealized losses with a loss position for more than 12 months, gross unrealized losses | $ (347) | $ (1,760)

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