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Loss Per Share (Tables)
3 Months Ended
Oct. 31, 2018
Loss Per Share [Abstract]  
Summary of shares excluded from the diluted earnings per share

  Three Months Ended
October 31,
 
  2018  2017 
  (in thousands) 
Stock options  1,243   1,273 
Non-vested restricted Class B common stock  49   223 
Shares excluded from the calculation of diluted earnings per share  1,292   1,496