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Net Income per Common Share (Tables)
 3 Months Ended
Oct. 31, 2015
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,
 
2015
 
2014
Numerator: (in thousands)
 
 
 
Earnings from continuing operations (Numerator for basic and diluted Class A Nonvoting Common Share)
$
18,703

 
$
15,499

Less:
 
 
 
Preferential dividends
(783
)
 
(794
)
Preferential dividends on dilutive stock options
(1
)
 
(1
)
Numerator for basic and diluted earnings from continuing operations per Class B Voting Common Share
$
17,919

 
$
14,704

Denominator: (in thousands)
 
 
 
Denominator for basic earnings from continuing operations per share for both Class A and Class B
51,029

 
51,251

Plus: Effect of dilutive stock options
60

 
62

Denominator for diluted earnings from continuing operations per share for both Class A and Class B
51,089

 
51,313

Earnings from continuing operations per Class A Nonvoting Common Share:
 
 
 
Basic
$
0.37

 
$
0.30

Diluted
$
0.37

 
$
0.30

Earnings from continuing operations per Class B Voting Common Share:
 
 
 
Basic
$
0.35

 
$
0.29

Diluted
$
0.35

 
$
0.29

Loss from discontinued operations per Class A Nonvoting Common Share:
 
 
 
Basic
$
—

 
$
(0.03
)
Diluted
$
—

 
$
(0.04
)
Loss from discontinued operations per Class B Voting Common Share:
 
 
 
Basic
$
—

 
$
(0.04
)
Diluted
$
—

 
$
(0.04
)
Net earnings per Class A Nonvoting Common Share:
 
 
 
Basic
$
0.37

 
$
0.27

Diluted
$
0.37

 
$
0.26

Net earnings per Class B Voting Common Share:
 
 
 
Basic
$
0.35

 
$
0.25

Diluted
$
0.35

 
$
0.25