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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jul. 31, 2015 | Jul. 31, 2014
--- | --- | ---
Assets: |  |
Available-for-sale securities | $ 40,287 | $ 12,873
Foreign exchange forwards | 38 |
Total | 40,325 |
Liabilities: |  |
Foreign exchange forwards | 39 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets: |  |
Available-for-sale securities | $ 6,505 |
Foreign exchange forwards |  |
Total | $ 6,505 |
Liabilities: |  |
Foreign exchange forwards |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets: |  |
Available-for-sale securities | $ 33,782 | $ 12,873
Foreign exchange forwards | 38 |
Total | 33,820 |
Liabilities: |  |
Foreign exchange forwards | $ 39 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets: |  |
Available-for-sale securities |  |
Foreign exchange forwards |  |
Total |  |
Liabilities: |  |
Foreign exchange forwards |  |

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