Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Allowance for doubtful accounts
Balance at beginning of period	$ 2.3	$ 2.4	$ 2.7
Additions, net of reversals	0.5	0.4	0.6
Usage	(0.2)	(0.3)	(0.8)
Currency translation effect	0.2	(0.2)	(0.1)
Balance at end of period	$ 2.8	$ 2.3	$ 2.4