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Loss Per Share (Tables)
3 Months Ended
Oct. 31, 2019
Earnings Per Share [Abstract]  
Schedule of shares excluded from the diluted earnings per share

  

Three Months Ended
October 31,

 
  

2019

  

2018

 
   (in thousands) 
Stock options    1,190     1,243 
Non-vested restricted Class B common stock    616    49 
Shares excluded from the calculation of diluted earnings per share    1,806    1,292