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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Assets:    
Available-for-sale securities $ 40,287 $ 12,873
Foreign exchange forwards 38
Total 40,325  
Liabilities:    
Foreign exchange forwards 39
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets:    
Available-for-sale securities $ 6,505
Foreign exchange forwards  
Total $ 6,505  
Liabilities:    
Foreign exchange forwards  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets:    
Available-for-sale securities $ 33,782 $ 12,873
Foreign exchange forwards 38  
Total 33,820  
Liabilities:    
Foreign exchange forwards $ 39  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets:    
Available-for-sale securities
Foreign exchange forwards  
Total  
Liabilities:    
Foreign exchange forwards