Summary of Significant Accounting Policies - Interest and Foreign Exchange (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Accounting Policies [Abstract]
Interest and other expense	$ 44,655	$ 42,386	$ 32,260
Foreign exchange (gain) loss	(1,392)	1,233	(1,348)
Interest and foreign exchange	$ 43,263	$ 43,619	$ 30,912