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Investment (Income), Net - Net (Gain) on Marketable Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2025 | Aug. 31, 2024
Net Loss (Gain) on Marketable Securities |  |
Unrealized (gains) on marketable equity securities | $ (8,586) | $ (5,778)
Realized (gains) on marketable equity securities | (97) | (195)
Realized losses on available-for-sale debt securities | 10 | 2
Net (gain) on marketable securities | $ (8,673) | $ (5,971)

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