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Stock-based Payment Compensation (Tables)
 9 Months Ended
Apr. 30, 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 nine months ended April 30, 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, 2016
 
38,902

 
$
12.15

 
4.96
 
$
508,401

Grants of options
 
894

 
27.66

 
 
 
 
Exercises
 
(20,598
)
 
8.19

 
 
 
 
Forfeitures or expirations
 
(319
)
 
17.99

 
 
 
 
Outstanding as of April 30, 2017
 
18,879

 
$
17.11

 
6.73
 
$
260,392

Exercisable as of April 30, 2017
 
11,428

 
$
15.78

 
6.13
 
$
172,766
Recognized stock-based compensation expense
The table below sets forth the stock-based payment compensation recognized by the Company:
 
 
Three Months Ended April 30,
 
Nine Months Ended April 30,
(In thousands)
 
2017
 
2016
 
2017
 
2016
General and administrative
 
$
4,180

 
$
4,320

 
$
13,176

 
$
13,758

Yard operations
 
828

 
714

 
2,437

 
2,076

Total stock-based payment compensation
 
$
5,008

 
$
5,034

 
$
15,613

 
$
15,834