Goodwill and Other Long-Lived Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions		12 Months Ended
		May 31, 2024	May 31, 2023
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 78.6	$ 80.0
Acquisitions and purchase accounting adjustments	[1]	1.1	(0.8)
Translation adjustments		(0.1)	(0.6)
Goodwill, Ending Balance		$ 79.6	$ 78.6

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