Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Allowance for doubtful accounts
Balance at beginning of period	$ 2,670	$ 2,176	$ 2,701
Additions, net of reversals	613	1,661	773
Usage	(835)	(1,291)	(1,311)
Currency translation effect	(40)	124	13
Balance at end of period	$ 2,408	$ 2,670	$ 2,176