Investment (Income), Net - Investment (Income), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Investment Income, Net [Abstract]
Interest (income)	$ (4,259)	$ (3,172)	$ (11,469)	$ (10,235)
Net (gain) loss on marketable securities	(3,594)	5,559	(17,816)	(5,125)
Dividend (income)	(4,326)	(3,653)	(6,324)	(5,458)
Investment (income), net	$ (12,179)	$ (1,266)	$ (35,609)	$ (20,818)