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Stock-based Payment Compensation (Tables)
 3 Months Ended
Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of option activity for stock options
The following is a summary of activity for the Company’s stock options for the three months ended October 31, 2018:
(In thousands, except per share and term data)
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (In years)
 
Aggregate Intrinsic Value
Outstanding as of July 31, 2018
 
17,797

 
$
20.29

 
6.19
 
$
660,268

Grants of options
 
—

 
—

 
 
 
 
Exercises
 
(62
)
 
19.93

 
 
 
 
Forfeitures or expirations
 
(37
)
 
19.10

 
 
 
 
Outstanding as of October 31, 2018
 
17,698

 
$
20.29

 
5.91
 
$
506,512

Exercisable as of October 31, 2018
 
13,387

 
$
18.06

 
5.38
 
$
412,993
Recognized stock-based compensation expense
The table below sets forth the stock-based compensation recognized by the Company:
 
 
Three Months Ended October 31,
(In thousands)
 
2018
 
2017
General and administrative
 
$
4,989

 
$
4,454

Yard operations
 
1,032

 
852

Total stock-based compensation
 
$
6,021

 
$
5,306