Goodwill and Other Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions		12 Months Ended
		May 31, 2025	May 31, 2024
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 79.6	$ 78.6
Acquisitions and purchase accounting adjustments	[1]		1.1
Translation adjustments		(0.0)	(0.1)
Goodwill, Ending Balance		$ 79.6	$ 79.6

[1] For additional information regarding acquisitions, refer to “Note 15 – Acquisitions.”