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Net Income per Common Share (Tables)
 3 Months Ended
Oct. 31, 2017
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,
 
2017
 
2016
Numerator: (in thousands)
 
 
 
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share)
$
25,836

 
$
22,553

Less:
 
 
 
Preferential dividends
(799
)
 
(788
)
Preferential dividends on dilutive stock options
(16
)
 
(14
)
Numerator for basic and diluted earnings per Class B Voting Common Share
$
25,021

 
$
21,751

Denominator: (in thousands)
 
 
 
Denominator for basic earnings for both Class A and Class B
51,440

 
50,634

Plus: Effect of dilutive stock options
943

 
821

Denominator for diluted earnings per share for both Class A and Class B
52,383

 
51,455

Net earnings per Class A Nonvoting Common Share:
 
 
 
Basic
$
0.50

 
$
0.45

Diluted
$
0.49

 
$
0.44

Net earnings per Class B Voting Common Share:
 
 
 
Basic
$
0.49

 
$
0.43

Diluted
$
0.48

 
$
0.42