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Income Taxes (Details 4) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Schedule Of Deferred Tax Assets (Liabilities) [Line Items]    
Net deferred tax assets $ 26,914 $ 31,152
North America    
Schedule Of Deferred Tax Assets (Liabilities) [Line Items]    
North America current assets 3,396 1,803
North America non-current assets 28,856 36,639
Foreign    
Schedule Of Deferred Tax Assets (Liabilities) [Line Items]    
Foreign non-current liabilities $ (5,338) $ (7,290)