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Earnings Per Share (Tables)
6 Months Ended
Jan. 31, 2017
Earnings Per Share [Abstract]  
Summary of weighted-average number of shares used in the calculation of basic and diluted earnings per share

  Three Months Ended
January 31,
  Six Months Ended
January 31,
 
  

2017

  

2016

  

2017

  

2016

 
  (in thousands) 
Basic weighted-average number of shares  22,768   22,799   22,740   22,867 
Effect of dilutive securities:                
Stock options  77      58    
Non-vested restricted Class B common stock  118      133   17 
                 
Diluted weighted-average number of shares  22,963   22,799   22,931   22,884 
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) 
Shares excluded from the calculation of diluted earnings per share  3   265   18   266