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Earnings (Loss) Per Share (Tables)
6 Months Ended
Jan. 31, 2017
Earnings (Loss) Per Share [Abstract]  
Summary of shares excluded from the diluted earnings per share computations
  Three Months Ended
January 31,
  Six Months Ended
January 31,
 
  2017  2016  2017  2016 
  (in thousands) 
Stock options  9   6   8   4 
Non-vested restricted Class B common stock  111   35   138   173 
                 
Shares excluded from the calculation of diluted (loss) earnings per share  120   41   146   177 
Schedule of the exercise price was greater than the average market price of the Class B common shares
  Three Months Ended
January 31,
  Six Months Ended
January 31,
 
  2017  2016  2017  2016 
  (in thousands) 
Stock options  88   -   88   -