Comprehensive Income (Loss) - Summary of Tax Effects on Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ 1.2	$ (1.3)	$ (6.8)
Foreign currency translation, tax	0.0	0.0	0.0
Foreign currency translation, net of tax	1.2	(1.3)	(6.8)
Pension liability adjustment, before tax	(1.4)	3.1	(0.8)
Pension liability adjustment, tax	0.3	(0.7)	0.1
Pension liability adjustment, net of tax	(1.1)	2.4	(0.7)
Cash flow hedges, before tax	2.6	(6.7)	4.5
Cash flow hedges, tax	(0.6)	1.6	(1.0)
Cash flow hedges, net of tax	2.0	(5.1)	3.5
Other comprehensive income (loss), before tax	2.4	(4.9)	(3.1)
Other comprehensive income (loss), tax	(0.3)	0.9	(0.9)
Other comprehensive income (loss)	$ 2.1	$ (4.0)	$ (4.0)