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Stock-based Payment Compensation (Tables)
 9 Months Ended
Apr. 30, 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 nine months ended April 30, 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
 
2,383

 
36.78

 
 
 
 
Exercises
 
(1,623
)
 
15.00

 
 
 
 
Forfeitures or expirations
 
(147
)
 
20.92

 
 
 
 
Outstanding as of April 30, 2018
 
19,387

 
$
19.70

 
6.24
 
$
608,338

Exercisable as of April 30, 2018
 
13,095

 
$
16.79

 
5.52
 
$
449,020
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)
 
2018
 
2017
 
2018
 
2017
General and administrative
 
$
4,883

 
$
4,180

 
$
14,327

 
$
13,176

Yard operations
 
1,058

 
828

 
2,912

 
2,437

Total stock-based payment compensation
 
$
5,941

 
$
5,008

 
$
17,239

 
$
15,613