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Income Taxes (Details 4) - USD ($) $ in Thousands | Jul. 31, 2018 | Jul. 31, 2017
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Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |
Net deferred tax liabilities | $ 19,263 | $ 1,997
UNITED STATES |  |
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |
U.S. current liabilities | 0 | (92)
Non-current liabilities | 16,018 | (1,054)
International [Member] |  |
Schedule Of Deferred Tax Assets (Liabilities) [Line Items] |  |
Non-current liabilities | $ (3,245) | $ (2,959)

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