Restructuring and Other (Income) Expense, Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Income, Net (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and other (income) expense, net	$ 2.6	$ 0.0	$ (4.2)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0.0
Expense	$ 2.6
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Restructuring and other (income) expense, net
Payments	$ (0.5)
Adjustments	0.0
Ending Balance	$ 2.1	$ 0.0