Income Taxes - Earnings before Income Taxes (Detail) - USD ($) $ in Millions		12 Months Ended
		May 31, 2025	May 31, 2024	May 31, 2023
Income Tax Disclosure [Abstract]
U.S. based operations		$ 114.6	$ 166.3	$ 102.7
Non – U.S. based operations		33.5	49.9	26.0
Earnings before income taxes		148.1	216.2	128.7
Net earnings attributable to noncontrolling interests	[1]	8.6	15.4	12.6
Earnings before income taxes attributable to controlling interest		$ 139.5	$ 200.8	$ 116.1

[1] Net earnings attributable to noncontrolling interests are not taxable to the Company.