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Net (Gain) Loss on Marketable Securities (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2024
May 31, 2023
May 31, 2022
Net Loss (Gain) on Marketable Securities      
Unrealized (gains) losses on marketable equity securities $ (19,703) $ 2,667 $ 19,164
Realized (gains) on marketable equity securities (290) (551) (1,488)
Realized losses (gains) on available-for-sale debt securities 79 (30) 30
Net (gain) loss on marketable securities $ (19,914) $ 2,086 $ 17,706