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Stock-based Payment Compensation (Tables)
 6 Months Ended
Jan. 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 six months ended January 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, 2016
 
19,451

 
$
24.30

 
4.96
 
$
508,401

Grants of options
 
428

 
55.02

 
 
 
 
Exercises
 
(9,892
)
 
16.07

 
 
 
 
Forfeitures or expirations
 
(131
)
 
36.22

 
 
 
 
Outstanding as of January 31, 2017
 
9,856

 
$
33.75

 
6.85
 
$
226,630

Exercisable as of January 31, 2017
 
5,728

 
$
30.73

 
6.14
 
$
148,998
Recognized stock-based compensation expense
The table below sets forth the stock-based payment compensation recognized by the Company:
 
 
Three Months Ended January 31,
 
Six Months Ended January 31,
(In thousands)
 
2017
 
2016
 
2017
 
2016
General and administrative
 
$
4,712

 
$
4,710

 
$
8,996

 
$
9,438

Yard operations
 
808

 
676

 
1,609

 
1,362

Total stock-based payment compensation
 
$
5,520

 
$
5,386

 
$
10,605

 
$
10,800