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Net Income per Common Share (Tables)
 12 Months Ended
Jul. 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:
 
Years ended July 31,
 
2018
 
2017
 
2016
Numerator (in thousands):
 
 
 
 
 
Earnings (Numerator for basic and diluted earnings per Class A Nonvoting Common Share)
$
91,060

 
$
95,645

 
$
80,110

Less:
 
 
 
 
 
Preferential dividends
(799
)
 
(788
)
 
(783
)
Preferential dividends on dilutive stock options
(14
)
 
(14
)
 
(1
)
Numerator for basic and diluted earnings per Class B Voting Common Share
$
90,247

 
$
94,843

 
$
79,326

Denominator (in thousands):
 
 
 
 
 
Denominator for basic earnings per share for both Class A and Class B
51,677

 
51,056

 
50,541

Plus: Effect of dilutive equity awards
847

 
900

 
228

Denominator for diluted earnings per share for both Class A and Class B
52,524

 
51,956

 
50,769

Net earnings per Class A Nonvoting Common Share:
 
 
 
 
 
Basic
$
1.76

 
$
1.87

 
$
1.59

Diluted
$
1.73

 
$
1.84

 
$
1.58

Net earnings per Class B Voting Common Share:
 
 
 
 
 
Basic
$
1.75

 
$
1.86

 
$
1.57

Diluted
$
1.72

 
$
1.83

 
$
1.56