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Concentration of Risk and Segment Data - Narrative (Details) | 3 Months Ended
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Nov. 30, 2018 Customer Country | Nov. 30, 2017
Revenue, Major Customer [Line Items] |  |
Number of operating countries | Country | 29 |
Net Revenue | Geographic Concentration Risk | Foreign |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 92.70% | 92.30%
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 | 48.00% |
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 | 75 |
Concentration risk, percentage | 90.00% |

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