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(Loss) Earnings Per Share (Tables)
3 Months Ended
Oct. 31, 2016
(Loss) Earnings Per Share [Abstract]  
Summary of shares excluded from the diluted earnings per share computations
  Three Months Ended
October 31,
 
  2016  2015 
  (in thousands) 
Stock options  3   2 
Non-vested restricted Class B common stock  118   239 
Shares excluded from the calculation of diluted loss per share  121   241 
Schedule of the exercise price was greater than the average market price of the Class B common shares
  Three Months Ended
October 31,
 
  2016  2015 
  (in thousands) 
Stock options  88