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Net Income per Common Share (Tables)
 6 Months Ended
Jan. 31, 2019
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,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Earnings (Numerator for basic and diluted Class A Nonvoting Common Share)
$
29,227

 
$
4,273

 
$
59,864

 
$
30,109

Less:
 
 
 
 
 
 
 
Preferential dividends
—

 
—

 
(815
)
 
(799
)
Preferential dividends on dilutive stock options
—

 
—

 
(13
)
 
(16
)
Numerator for basic and diluted earnings per Class B Voting Common Share
$
29,227

 
$
4,273

 
$
59,036

 
$
29,294

Denominator: (in thousands)
 
 
 
 
 
 
 
Denominator for basic earnings per share for both Class A and Class B
52,532

 
51,698

 
52,366

 
51,569

Plus: Effect of dilutive stock options and restricted stock units
674

 
1,021

 
716

 
982

Denominator for diluted earnings per share for both Class A and Class B
53,206

 
52,719

 
53,082

 
52,551

Net earnings per Class A Nonvoting Common Share:
 
 
 
 
 
 
 
Basic
$
0.56

 
$
0.08

 
$
1.14

 
$
0.58

Diluted
$
0.55

 
$
0.08

 
$
1.13

 
$
0.57

Net earnings per Class B Voting Common Share:
 
 
 
 
 
 
 
Basic
$
0.56

 
$
0.08

 
$
1.13

 
$
0.57

Diluted
$
0.55

 
$
0.08

 
$
1.11

 
$
0.56