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Stock-based Payment Compensation (Tables)
 6 Months Ended
Jan. 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 six months ended January 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, 2017
 
18,774

 
$
17.14

 
6.48
 
$
269,449

Grants of options
 
2,348

 
36.58

 
 
 
 
Exercises
 
(1,194
)
 
14.35

 
 
 
 
Forfeitures or expirations
 
(21
)
 
17.72

 
 
 
 
Outstanding as of January 31, 2018
 
19,907

 
$
19.60

 
6.48
 
$
487,199

Exercisable as of January 31, 2018
 
12,753

 
$
16.66

 
5.71
 
$
349,585
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)
 
2018
 
2017
 
2018
 
2017
General and administrative
 
$
4,990

 
$
4,712

 
$
9,444

 
$
8,996

Yard operations
 
1,002

 
808

 
1,854

 
1,609

Total stock-based payment compensation
 
$
5,992

 
$
5,520

 
$
11,298

 
$
10,605