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Derivative Instruments (Tables)
9 Months Ended
Apr. 30, 2018
Derivative Instruments [Abstract]  
Schedule of derivative instruments outstanding contracts
Settlement Date   U.S. Dollar Amount     NOK Amount  
Jun-18     500,000       4,004,545  
Jul-18     500,000       3,999,545  
Aug-18     500,000       3,994,495  
Sep-18     500,000       3,989,945  
Oct-18     500,000       3,986,095  
Nov-18     500,000       3,983,595  
                 
Total     3,000,000       23,958,220
Schedule of derivative assets fair value
Asset Derivatives   Balance Sheet Location   April 30,
2018
    July 31,
2017
 
        (in thousands)  
Derivatives not designated or not qualifying as hedging instruments:                
Foreign exchange forward contracts   Other current assets   $     -     $ 137
Schedule of derivative instruments on consolidated statements of comprehensive income (loss)
    Amount of Loss Recognized on Derivatives  
    Three Months Ended     Nine Months Ended  
  April 30,     April 30,  
Derivatives not designated or not qualifying as hedging instruments   Location of Loss Recognized on Derivatives   2018     2017     2018     2017  
          (in thousands)  
Foreign exchange forward contracts   Net loss resulting from foreign exchange transactions   $    -     $ (92 )   $ (1 )   $ (68 )