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Stock-based Payment Compensation (Tables)
 3 Months Ended
Oct. 31, 2017
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, 2017:
(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, 2017
 
18,774

 
$
17.14

 
6.48
 
$
269,449

Grants of options
 
2,108

 
35.74

 
 
 
 
Exercises
 
(672
)
 
13.78

 
 
 
 
Forfeitures or expirations
 
(19
)
 
17.71

 
 
 
 
Outstanding as of October 31, 2017
 
20,191

 
$
19.19

 
6.66
 
$
345,304

Exercisable as of October 31, 2017
 
12,263

 
$
16.26

 
5.83
 
$
245,676
Recognized stock-based compensation expense
The table below sets forth the stock-based payment compensation recognized by the Company:
 
 
Three Months Ended October 31,
(In thousands)
 
2017
 
2016
General and administrative
 
$
4,454

 
$
4,284

Yard operations
 
852

 
801

Total stock-based payment compensation
 
$
5,306

 
$
5,085