Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023
Leases [Abstract]
Operating lease expense	$ 10.1	$ 9.5
Financing lease expense:
Short-term lease expense	2.6	1.8
Variable lease expense	0.0	0.3
Total lease expense	$ 12.7	$ 11.6