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Net Income per Common Share (Tables)
 12 Months Ended
Jul. 31, 2016
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,
 
2016
 
2015
 
2014
Numerator: (in thousands)
 
 
 
 
 
Earnings (loss) from continuing operations
$
80,110

 
$
4,902

 
$
(48,146
)
Less:
 
 
 
 
 
Restricted stock dividends
—

 
—

 
(92
)
Numerator for basic and diluted earnings (loss) from continuing operations per Class A Nonvoting Common Share
$
80,110

 
$
4,902

 
$
(48,238
)
Less:
 
 
 
 
 
Preferential dividends
(783
)
 
(794
)
 
(813
)
Preferential dividends on dilutive stock options
(1
)
 
(1
)
 
(6
)
Numerator for basic and diluted earnings (loss) from continuing operations per Class B Voting Common Share
$
79,326

 
$
4,107

 
$
(49,057
)
Denominator: (in thousands)
 
 
 
 
 
Denominator for basic earnings from continuing operations per share for both Class A and Class B
50,541

 
51,285

 
51,866

Plus: Effect of dilutive stock options
228

 
98

 
—

Denominator for diluted earnings from continuing operations per share for both Class A and Class B
50,769

 
51,383

 
51,866

Earnings (loss) from continuing operations per Class A Nonvoting Common Share:
 
 
 
 
 
Basic
$
1.59

 
$
0.10

 
$
(0.93
)
Diluted
$
1.58

 
$
0.10

 
$
(0.93
)
Earnings (loss) from continuing operations per Class B Voting Common Share:
 
 
 
 
 
Basic
$
1.57

 
$
0.08

 
$
(0.95
)
Diluted
$
1.56

 
$
0.08

 
$
(0.95
)
(Loss) earnings from discontinued operations per Class A Nonvoting Common Share:
 
 
 
 
 
Basic
$
—

 
$
(0.04
)
 
$
0.04

Diluted
$
—

 
$
(0.04
)
 
$
0.04

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

 
$
(0.04
)
 
$
0.05

Diluted
$
—

 
$
(0.04
)
 
$
0.05

Net earnings (loss) per Class A Nonvoting Common Share:
 
 
 
 
 
Basic
$
1.59

 
$
0.06

 
$
(0.89
)
Diluted
$
1.58

 
$
0.06

 
$
(0.89
)
Net earnings (loss) per Class B Voting Common Share:
 
 
 
 
 
Basic
$
1.57

 
$
0.04

 
$
(0.90
)
Diluted
$
1.56

 
$
0.04

 
$
(0.90
)