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Income Taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |  |
Net deferred tax (liabilities) assets | $ (1,997) | $ 21,134 |
UNITED STATES |  |  |
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic | 385,526 | 339,013 | $ 286,169
U.S. current (liabilities) assets | (92) | 1,444 |
U.S. non-current assets | 1,054 | 23,506 |
International [Member] |  |  |
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |  |
International non-current liabilities | (2,959) | (3,816) |
Income (Loss) from Continuing Operations before Income Taxes, Foreign | $ 54,574 | $ 56,852 | $ 45,900

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