Other Comprehensive Income (Loss) - Summary of Tax Effects on Each Component of OCI (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Nov. 30, 2024	Aug. 31, 2024	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2024	Nov. 30, 2023
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ (4.8)		$ 0.5		$ (2.7)	$ (0.3)
Foreign currency translation, tax	0.0		0.0		0.0	0.0
Foreign currency translation, net of tax	(4.8)		0.5		(2.7)	(0.3)
Pension liability adjustment, before tax	(1.3)		0.0		(1.3)	0.0
Pension liability adjustment, tax	0.3		0.0		0.3	0.0
Pension liability adjustment, net of tax	(1.0)		0.0		(1.0)	0.0
Cash flow hedges, before tax	(0.1)		13.8		0.0	4.2
Cash flow hedges, tax	0.0		(3.2)		0.0	(1.0)
Cash flow hedges, net of tax	(0.1)		10.6		0.0	3.2
Other comprehensive income (loss), before tax	(6.2)		14.3		(4.0)	3.9
Other comprehensive income (loss), tax	0.3		(3.2)		0.3	(1.0)
Other comprehensive income (loss)	$ (5.9)	$ 2.2	$ 11.1	$ (8.2)	$ (3.7)	$ 2.9