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, 2023	Aug. 31, 2023	Nov. 30, 2022	Aug. 31, 2022	Nov. 30, 2023	Nov. 30, 2022
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ 0.5		$ (2.6)		$ (0.3)	$ (6.0)
Foreign currency translation, tax	0.0		0.0		0.0	0.0
Foreign currency translation, net of tax	0.5		(2.6)		(0.3)	(6.0)
Cash flow hedges, before tax	13.8		(1.2)		4.2	(14.1)
Cash flow hedges, tax	(3.2)		0.3		(1.0)	3.3
Cash flow hedges, net of tax	10.6		(0.9)		3.2	(10.8)
Other comprehensive income (loss), before tax	14.3		(3.8)		3.9	(20.1)
Other comprehensive income (loss), tax	3.2		(0.3)		1.0	(3.3)
Other comprehensive income (loss)	$ 11.1	$ (8.2)	$ (3.5)	$ (13.3)	$ 2.9	$ (16.8)