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)