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Fair Value Measurements (Tables)
 12 Months Ended
Jul. 31, 2021
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) 
July 31, 2021                
Assets:                
Foreign exchange forward contracts  $        -   $   $        -   $        - 
                     
Liabilities:                    
Foreign exchange forward contracts  $-   $54   $-   $54 
                     
July 31, 2020                    
Assets:                    
Foreign exchange forward contracts  $-   $10   $-   $10 
                     
Liabilities:                    
Foreign exchange forward contracts  $-   $-   $-   $-