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Income Taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |  |
Net deferred tax assets | $ 21,134 | $ 26,914 |
UNITED STATES |  |  |
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic | 339,013 | 286,169 | $ 230,966
U.S. current assets | 1,444 | 3,396 |
U.S. non-current assets | 23,506 | 28,856 |
International [Member] |  |  |
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |  |
International non-current liabilities | (3,816) | (5,338) |
Income (Loss) from Continuing Operations before Income Taxes, Foreign | $ 56,852 | $ 45,900 | $ 39,069

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