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Net Income per Common Share (Tables)
 6 Months Ended
Jan. 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 January 31,
 
Six months ended January 31,
 
2017
 
2016
 
2017
 
2016
Numerator: (in thousands)
 
 
 
 
 
 
 
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share)
$
25,297

 
$
15,290

 
$
47,850

 
$
33,993

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
$
25,297

 
$
15,290

 
$
47,048

 
$
33,209

Denominator: (in thousands)
 
 
 
 
 
 
 
Denominator for basic earnings per share for both Class A and Class B
$
51,054

 
$
50,527

 
$
50,844

 
$
50,778

Plus: Effect of dilutive stock options and restricted stock units
900

 
120

 
877

 
90

Denominator for diluted earnings per share for both Class A and Class B
$
51,954

 
$
50,647

 
$
51,721

 
$
50,868

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

 
$
0.30

 
$
0.94

 
$
0.67

Diluted
$
0.49

 
$
0.30

 
$
0.93

 
$
0.67

Net earnings per Class B Voting Common Share:
 
 
 
 
 
 
 
Basic
$
0.50

 
$
0.30

 
$
0.93

 
$
0.65

Diluted
$
0.49

 
$
0.30

 
$
0.91

 
$
0.65