Stock-Based Compensation (Tables)
 9 Months Ended
Apr. 30, 2019
Share-based Compensation [Abstract]  
Summary of stock option activity
The following table summarizes stock option activity during the nine months ended April 30, 2019:
 
Options
Outstanding
 
Weighted
Average
Exercise Price
Outstanding as of July 31, 2018
6,785,812

 
$
34.93

Granted
908,925

 
$
58.02

Exercised
(1,059,460
)
 
$
25.02

Canceled
(56,350
)
 
$
50.79

Outstanding as of April 30, 2019
6,578,927

 
$
39.57
Summary of information concerning outstanding and exercisable options
The following table summarizes information concerning outstanding and exercisable options as of April 30, 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
 
245,558

 
0.68
 
$
21.10

 
245,558

 
$
21.10

$27.70 to $32.69
 
1,282,662

 
4.76
 
$
28.56

 
1,282,662

 
$
28.56

$32.70 to $37.69
 
1,226,314

 
3.30
 
$
34.44

 
1,225,481

 
$
34.44

$37.70 to $42.69
 
1,294,317

 
5.45
 
$
40.36

 
1,250,717

 
$
40.29

$42.70 and above
 
2,530,076

 
8.33
 
$
49.04

 
858,571

 
$
43.92

 
 
6,578,927

 
5.84
 
$
39.57

 
4,862,989

 
$
35.39