Customer Concentration - Additional Information (Detail)		12 Months Ended
	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Customer Concentration Risk | Sales Revenue, Net | Customer One Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		20.00%	17.00%	17.00%
Customer Concentration Risk | Sales Revenue, Net | Customer Two Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			14.00%
Credit Concentration Risk | Accounts Receivable | Customer One Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%	13.00%
Credit Concentration Risk | Accounts Receivable | Customer Two Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	13.00%
Credit Concentration Risk | Accounts Receivable | Customer Three Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%