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Concentration of Risk and Segment Data - Narrative (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2018 Country | Feb. 28, 2017 | Feb. 28, 2018 Customer Country | Feb. 28, 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 | 91.90% | 90.90% | 92.10% | 91.70%
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 |  |  | 51.00% |
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 |  |  | 74 |
Concentration risk, percentage |  |  | 90.00% |

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