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Fair Value Measurements (Tables)
12 Months Ended
Jul. 31, 2017
Fair Value Measurements [Abstract]  
Summary of balance of assets and liabilities measured at fair value on a recurring basis

July 31, 2017

(in thousands)

 Level 1  Level 2  Level 3  Total 
Assets:                
Foreign exchange forward contracts $  $137  $  $137 
                 
Liabilities:                
Foreign exchange forward contracts $  $  $  $ 

 

July 31, 2016

(in thousands)

 Level 1  Level 2  Level 3  Total 
Assets:                
Foreign exchange forward contracts $  $21  $  $21 
                 
Liabilities:                
Foreign exchange forward contracts $  $15  $  $15