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Derivative Instruments (Tables)
 3 Months Ended
Oct. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of outstanding foreign exchange contracts
Settlement Date  U.S. Dollar Amount   NOK Amount 
Nov-20   200,000    1,819,209 
Dec-20   200,000    1,819,109 
Jan-21   200,000    1,818,709 
Feb-21   200,000    1,818,509 
Total  $800,000    7,275,536 
Settlement Date  U.S. Dollar Amount   EUR Amount 
Nov-20   175,000    149,365 
Dec-20   175,000    149,276 
Jan-21   175,000    149,111 
Feb-21   175,000    149,009 
   $700,000    596,761 
Schedule of fair value of derivative assets and liabilities
   October 31,   July 31, 
   2020   2020 
         
Assets and Liabilities Derivatives:  Balance Sheet Location  (in thousands) 
Derivatives not designated or not qualifying as hedging instruments        
Foreign exchange forward contracts  Other current assets  $-   $10 
Foreign exchange forward contracts  Accrued expenses and other current liabilities  $41   $- 
Schedule of derivative instruments on consolidated statements of comprehensive loss
      Amount of Loss Recognized on Derivatives 
      Three Months Ended 
   October 31, 
Amount of Loss Recognized on Derivatives  (in thousands) 
Derivatives not designated or not qualifying as hedging instruments  Location of Loss Recognized on Derivatives  2020   2019 
Foreign exchange forward contracts  Net loss resulting from foreign exchange transactions  $(41)  $(74)