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Net Income per Common Share (Tables)
 9 Months Ended
Apr. 30, 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:
 
Three months ended April 30,
 
Nine months ended April 30,
 
2018
 
2017
 
2018
 
2017
Numerator: (in thousands)
 
 
 
 
 
 
 
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share)
$
26,000

 
$
22,553

 
$
56,109

 
$
70,403

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
$
26,000

 
$
22,553

 
$
55,294

 
$
69,601

Denominator: (in thousands)
 
 
 
 
 
 
 
Denominator for basic earnings per share for both Class A and Class B
51,747

 
51,227

 
51,628

 
50,972

Plus: Effect of dilutive stock options and restricted stock units
982

 
974

 
982

 
910

Denominator for diluted earnings per share for both Class A and Class B
52,729

 
52,201

 
52,610

 
51,882

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

 
$
0.44

 
$
1.09

 
$
1.38

Diluted
$
0.49

 
$
0.43

 
$
1.07

 
$
1.36

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

 
$
0.44

 
$
1.07

 
$
1.37

Diluted
$
0.49

 
$
0.43

 
$
1.05

 
$
1.34