Summary of Significant Accounting Policies - Interest and Foreign Exchange (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Accounting Policies [Abstract]
Interest and other expense	$ 79.2	$ 55.7	$ 44.7
Foreign exchange (gain) loss	6.2	1.7	(1.4)
Interest and foreign exchange	$ 85.4	$ 57.4	$ 43.3