Stockholders' Equity - Share-Based Awards Available for Grant (Details)	3 Months Ended
	Oct. 31, 2018 shares
Shares Available for Grant
Shares available for grant, beginning balance (in shares)	22,791,000
Options granted (in shares)	(64,000)
Restricted stock units granted (in shares)	(340,000)	[1]
Share-based awards canceled/forfeited/expired (in shares)	1,441,000	[1],[2]
Shares available for grant, ending balance (in shares)	23,828,000
Pool shares reduced for each share granted (in shares)	2.3
Pool shares increased for each share forfeited (in shares)	2.3

[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. Stock Option Activity and Related Share-Based Compensation Expense