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Fair Value Measurements (Tables)
9 Months Ended
Apr. 30, 2018
Fair Value Measurements [Abstract]  
Summary of balance of assets and liabilities measured at fair value on a recurring basis
    Level 1 (1)     Level 2 (2)     Level 3 (3)     Total  
    (in thousands)  
April 30, 2018                        
Assets:                        
Foreign exchange forward contracts   $      -     $     -     $     -     $     -  
                                 
Liabilities:                                
Foreign exchange forward contracts   $ -     $ -     $ -     $ -  
                                 
July 31, 2017                                
Assets:                                
Foreign exchange forward contracts   $ -     $ 137     $ -     $ 137  
                                 
Liabilities:                                
Foreign exchange forward contracts   $ -     $ -     $ -     $ -  

 

(1) – quoted prices in active markets for identical assets or liabilities

 

(2) – observable inputs other than quoted prices in active markets for identical assets and liabilities

 

(3) – no observable pricing inputs in the market