Equity - Summary of Restricted Stock Share and Restricted Stock Unit Grant Transactions for Shares, both Vested and Unvested (Detail) - shares		12 Months Ended
		Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Equity [Abstract]
Beginning Balance	[1]	4,959,364	4,575,478	4,374,325
Granted		538,260	469,825	313,540
Forfeited		(190,854)	(85,939)	(112,387)
Ending Balance	[1]	5,306,770	4,959,364	4,575,478

[1] Balance represents cumulative grants net of forfeitures.