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Stock-Based Compensation (Tables)
 6 Months Ended
Jan. 31, 2019
Share-based Compensation [Abstract]  
Summary of stock option activity
The following table summarizes stock option activity during the six months ended January 31, 2019:
 
Options
Outstanding
 
Weighted
Average
Exercise Price
Outstanding as of July 31, 2018
6,785,812

 
$
34.93

Granted
908,925

 
$
58.02

Exercised
(794,462
)
 
$
24.12

Canceled
(34,772
)
 
$
49.81

Outstanding as of January 31, 2019
6,865,503

 
$
39.16
Summary of information concerning outstanding and exercisable options
The following table summarizes information concerning outstanding and exercisable options as of January 31, 2019:
Range of Exercise Prices
 
Number Outstanding
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price of Outstanding Options
 
Number
Exercisable
 
Weighted
Average
Exercise
Price of Exercisable Options
$ 0.00 to $27.69
 
352,833

 
0.92
 
$
21.10

 
352,833

 
$
21.10

$27.70 to $32.69
 
1,389,473

 
4.92
 
$
28.57

 
1,380,940

 
$
28.55

$32.70 to $37.69
 
1,243,171

 
3.54
 
$
34.44

 
1,242,338

 
$
34.44

$37.70 to $42.69
 
1,304,734

 
5.69
 
$
40.35

 
1,261,134

 
$
40.28

$42.70 and above
 
2,575,292

 
8.57
 
$
49.02

 
882,543

 
$
43.91

 
 
6,865,503

 
5.98
 
$
39.16

 
5,119,788

 
$
35.00