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Net Income per Common Share (Tables)
 3 Months Ended
Oct. 31, 2016
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,
 
2016
 
2015
Numerator: (in thousands)
 
 
 
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share)
$
22,553

 
$
18,703

Less:
 
 
 
Preferential dividends
(788
)
 
(783
)
Preferential dividends on dilutive stock options
(14
)
 
(1
)
Numerator for basic and diluted earnings per Class B Voting Common Share
$
21,751

 
$
17,919

Denominator: (in thousands)
 
 
 
Denominator for basic earnings for both Class A and Class B
50,634

 
51,029

Plus: Effect of dilutive stock options
821

 
60

Denominator for diluted earnings per share for both Class A and Class B
51,455

 
51,089

Net earnings per Class A Nonvoting Common Share:
 
 
 
Basic
$
0.45

 
$
0.37

Diluted
$
0.44

 
$
0.37

Net earnings per Class B Voting Common Share:
 
 
 
Basic
$
0.43

 
$
0.35

Diluted
$
0.42

 
$
0.35