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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% |

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