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Summary of Significant Accounting Policies Foreign Currency Hedging (Details) | 12 Months Ended
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Jul. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative maturity | 18 months

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- References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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