Investment (Income), Net - Investment (Income), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Investment Income, Net [Abstract]
Interest (income)	$ (3,450)	$ (3,080)	$ (7,210)	$ (7,063)
Net (gain) on marketable securities	(5,549)	(4,713)	(14,222)	(10,684)
Dividend (income)	(1,027)	(733)	(1,998)	(1,805)
Investment (income), net	$ (10,026)	$ (8,526)	$ (23,430)	$ (19,552)