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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