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Fair Value Measurements (Tables)
 3 Months Ended
Oct. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule 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) 
October 31, 2020                
Assets:                
Foreign exchange forward contracts  $ -   $ -   $ -   $ - 
                 
Liabilities:                    
Foreign exchange forward contracts  $-   $41   $-   $41 
                     
July 31, 2020                    
Assets:                    
Foreign exchange forward contracts  $-   $10   $-   $10 
                     
Liabilities:                    
Foreign exchange forward contracts  $-   $   $-   $-