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Net Income per Common Share (Tables)
 3 Months Ended
Oct. 31, 2018
Earnings Per Share [Abstract]  
Reconciliations of Numerator and Denominator of Basic and Diluted Per Share
Reconciliations of the numerator and denominator of the basic and diluted per share computations for the Company’s Class A and Class B common stock are summarized as follows:
 
Three months ended October 31,
 
2018
 
2017
Numerator:
 
 
 
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share)
$
30,637

 
$
25,836

Less:
 
 
 
Preferential dividends
(815
)
 
(799
)
Preferential dividends on dilutive stock options
(13
)
 
(16
)
Numerator for basic and diluted earnings per Class B Voting Common Share
$
29,809

 
$
25,021

Denominator: (in thousands)
 
 
 
Denominator for basic earnings for both Class A and Class B
52,201

 
51,440

Plus: Effect of dilutive stock options
757

 
943

Denominator for diluted earnings per share for both Class A and Class B
52,958

 
52,383

Net earnings per Class A Nonvoting Common Share:
 
 
 
Basic
$
0.59

 
$
0.50

Diluted
$
0.58

 
$
0.49

Net earnings per Class B Voting Common Share:
 
 
 
Basic
$
0.57

 
$
0.49

Diluted
$
0.56

 
$
0.48