Customer Concentration - Additional Information (Detail)	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Customer Concentration Risk | Sales Revenue, Net | Customer One Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	20.00%	17.00%
Customer Concentration Risk | Sales Revenue, Net | Customer Two Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%		14.00%
Credit Concentration Risk | Accounts Receivable | Customer One Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%	13.00%
Credit Concentration Risk | Accounts Receivable | Customer Two Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		13.00%
Credit Concentration Risk | Accounts Receivable | Customer Three Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%