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Net Income per Common Share (Tables)
 12 Months Ended
Jul. 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:
 
Years ended July 31,
 
2017
 
2016
 
2015
Numerator (in thousands)
 
 
 
 
 
Earnings from continuing operations (Numerator for basic and diluted earnings from continuing operations per Class A Nonvoting Common Share)
$
95,645

 
$
80,110

 
$
4,902

Less:
 
 
 
 
 
Preferential dividends
(788
)
 
(783
)
 
(794
)
Preferential dividends on dilutive stock options
(14
)
 
(1
)
 
(1
)
Numerator for basic and diluted earnings from continuing operations per Class B Voting Common Share
$
94,843

 
$
79,326

 
$
4,107

Denominator (in thousands)
 
 
 
 
 
Denominator for basic earnings from continuing operations per share for both Class A and Class B
51,056

 
50,541

 
51,285

Plus: Effect of dilutive stock options
900

 
228

 
98

Denominator for diluted earnings from continuing operations per share for both Class A and Class B
51,956

 
50,769

 
51,383

Earnings from continuing operations per Class A Nonvoting Common Share:
 
 
 
 
 
Basic
$
1.87

 
$
1.59

 
$
0.10

Diluted
$
1.84

 
$
1.58

 
$
0.10

Earnings from continuing operations per Class B Voting Common Share:
 
 
 
 
 
Basic
$
1.86

 
$
1.57

 
$
0.08

Diluted
$
1.83

 
$
1.56

 
$
0.08

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

 
$
—

 
$
(0.04
)
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
$
1.87

 
$
1.59

 
$
0.06

Diluted
$
1.84

 
$
1.58

 
$
0.06

Net earnings per Class B Voting Common Share:
 
 
 
 
 
Basic
$
1.86

 
$
1.57

 
$
0.04

Diluted
$
1.83

 
$
1.56

 
$
0.04