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Stockholders' Equity (Tables)
 9 Months Ended
Apr. 30, 2018
Equity [Abstract]  
Total share-based compensation expense The following table summarizes the total share-based compensation expense that we recorded in operating income for the periods shown.
 
Three Months Ended
 
Nine Months Ended
(In millions)
April 30,
2018
 
April 30,
2017
 
April 30,
2018
 
April 30,
2017
Cost of revenue
$
14

 
$
2

 
$
30

 
$
6

Selling and marketing
25

 
19

 
75

 
66

Research and development
30

 
24

 
99

 
89

General and administrative
23

 
26

 
79

 
80

Total share-based compensation expense
$
92

 
$
71

 
$
283

 
$
241
Summary of share-based awards available for grant A summary of share-based awards available for grant under our 2005 Equity Incentive Plan for the nine months ended April 30, 2018 was as follows:
(Shares in thousands)
Shares
Available
for Grant
Balance at July 31, 2017
25,164

Options granted
—

Restricted stock units granted (1)
(1,580
)
Share-based awards canceled/forfeited/expired (1)(2)
2,966

Balance at April 30, 2018
26,550

____________________________________________________
(1)
RSUs granted from the pool of shares available for grant under our 2005 Equity Incentive Plan reduce the pool by 2.3 shares for each share granted. RSUs forfeited and returned to the pool of shares available for grant increase the pool by 2.3 shares for each share forfeited.
(2)
Stock options and RSUs canceled, expired or forfeited under our 2005 Equity Incentive Plan are returned to the pool of shares available for grant. Shares withheld for income taxes upon vesting of RSUs that were granted on or after July 21, 2016 are also returned to the pool of shares available for grant. Stock options and RSUs canceled, expired or forfeited under older expired plans are not returned to the pool of shares available for grant
Summary of stock option activity A summary of stock option activity for the nine months ended April 30, 2018 was as follows:
 
Options Outstanding
(Shares in thousands)
Number
of Shares
 
Weighted
Average
Exercise
Price
Per Share
Balance at July 31, 2017
7,488

 
$
104.50

Granted
—

 
—

Exercised
(1,717
)
 
86.16

Canceled or expired
(320
)
 
120.28

Balance at April 30, 2018
5,451

 
$
109.35

 
 
 
 
Exercisable at April 30, 2018
2,825

 
$
93.12
Summary of restricted stock unit activity A summary of restricted stock unit (RSU) activity for the nine months ended April 30, 2018 was as follows:
 
Restricted Stock Units
(Shares in thousands)
Number
of Shares
 
Weighted
Average
Grant Date
Fair Value
Nonvested at July 31, 2017
8,636

 
$
98.76

Granted
687

 
158.18

Unregistered restricted stock granted in connection with acquisitions
75

 
163.00

Vested
(1,074
)
 
79.40

Forfeited
(1,033
)
 
86.95

Nonvested at April 30, 2018
7,291

 
$
109.55