Investment (Income), Net - Net (Gain) Loss on Marketable Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Net Loss (Gain) on Marketable Securities
Unrealized (gains) losses on marketable equity securities	$ (3,289)	$ 16,049	$ (14,967)	$ 5,544
Realized (gains) on marketable equity securities	(305)	(10,490)	(2,859)	(10,755)
Realized losses on available-for-sale debt securities	0	0	10	86
Net (gain) loss on marketable securities	$ (3,594)	$ 5,559	$ (17,816)	$ (5,125)