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Stockholders' Equity (Tables)
 3 Months Ended
Oct. 31, 2020
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
(In millions)October 31, 2020October 31, 2019
Cost of revenue$15 $15 
Selling and marketing32 30 
Research and development38 38 
General and administrative26 28 
Total share-based compensation expense$111 $111 
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 three months ended October 31, 2020 was as follows:
(Shares in thousands)Shares
Available
for Grant
Balance at July 31, 202018,047 
Restricted stock units granted (1)
(363)
Options granted— 
Share-based awards canceled/forfeited/expired (1) (2)
1,592 
Balance at October 31, 202019,276 
(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 restricted stock unit activity
A summary of restricted stock unit (RSU) activity for the three months ended October 31, 2020 was as follows:
Restricted Stock Units
(Shares in thousands)Number
of Shares		Weighted
Average
Grant Date
Fair Value
Nonvested at July 31, 20205,664 $231.97 
Granted158 322.24 
Vested(480)163.73 
Forfeited(404)195.55 
Nonvested at October 31, 20204,938 $244.48 
Summary of stock option activity
A summary of stock option activity for the three months ended October 31, 2020 was as follows:
 Options Outstanding
(Shares in thousands)Number
of Shares		Weighted
Average
Exercise
Price
Per Share
Balance at July 31, 20202,681 $185.83 
Granted— — 
Exercised(402)121.96 
Canceled or expired(23)244.47 
Balance at October 31, 20202,256 $196.64 
Exercisable at October 31, 20201,452 $150.72