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Stock-based Payment Compensation (Tables)
 6 Months Ended
Jan. 31, 2019
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 six months ended January 31, 2019:
(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
 
150

 
47.19

 
 
 
 
Exercises
 
(294
)
 
17.74

 
 
 
 
Forfeitures or expirations
 
(98
)
 
26.33

 
 
 
 
Outstanding as of January 31, 2019
 
17,555

 
$
20.53

 
5.02
 
$
528,435

Exercisable as of January 31, 2019
 
14,077

 
$
18.51

 
4.40
 
$
452,199
Recognized stock-based compensation expense The table below sets forth the stock-based compensation recognized by the Company:
 
 
Three Months Ended January 31,
 
Six Months Ended January 31,
(In thousands)
 
2019
 
2018
 
2019
 
2018
General and administrative
 
$
4,691

 
$
4,990

 
$
9,680

 
$
9,444

Yard operations
 
1,238

 
1,002

 
2,270

 
1,854

Total stock-based compensation
 
$
5,929

 
$
5,992

 
$
11,950

 
$
11,298