Concentration of Risk and Segment Data - Narrative (Details)	3 Months Ended		9 Months Ended
	May 31, 2018 Country	May 31, 2017	May 31, 2018 Customer Country	May 31, 2017
Revenue, Major Customer [Line Items]
Number of operating countries | Country	29		29
Net Revenue | Geographic Concentration Risk | Foreign
Revenue, Major Customer [Line Items]
Concentration risk, percentage	91.20%	90.60%	91.80%	91.30%
Five Largest Customers That Account for a Percentage of Net Revenue | Net Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Top customers that comprise revenue			5
Concentration risk, percentage			50.00%
Group of Customers That Account for 90% of Net Revenue | Net Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Top customers that comprise revenue			77
Concentration risk, percentage			90.00%