Stockholders' Equity Share-Based Awards Available for Grant (Details)	3 Months Ended
	Oct. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]
Shares Available for Grant, Beginning Balance (in shares)	17,183,000
Options granted (in shares)	(3,000)
Restricted stock units granted (in shares)	(433,000)	[1]
Share-based awards canceled/forfeited/expired (in shares)	2,244,000	[1],[2]
Shares Available for Grant, Ending Balance (in shares)	18,991,000
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 restricted stock units canceled, expired or forfeited under our 2005 Equity Incentive Plan are returned to the pool of shares available for grant. Stock options and restricted stock units canceled, expired or forfeited under older expired plans are not returned to the pool of shares available for grant.