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Investment (Income), Net - Net Loss (Gain) on Marketable Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2025 | Feb. 29, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Net (Gain) Loss on Marketable Securities |  |  |  |
Unrealized losses (gains) on marketable equity securities | $ 16,049 | $ (12,015) | $ 5,544 | $ (18,439)
Realized (gains) losses on marketable equity securities | (10,490) | 1,742 | (10,755) | 1,874
Realized losses on available-for-sale debt securities | 0 | 3 | 86 | 69
Net loss (gain) on marketable securities | $ 5,559 | $ (10,270) | $ (5,125) | $ (16,496)

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