Stockholders' Equity (Details) (USD $)	0 Months Ended	3 Months Ended
	Aug. 23, 2013	Oct. 31, 2013		Oct. 31, 2012	Oct. 31, 2013 Stock Options [Member]	Oct. 31, 2013 Restricted Stock Units (RSUs) [Member]	Oct. 31, 2013 Cost of revenue [Member]	Oct. 31, 2012 Cost of revenue [Member]	Oct. 31, 2013 Selling and marketing [Member]	Oct. 31, 2012 Selling and marketing [Member]	Oct. 31, 2013 Research and development [Member]	Oct. 31, 2012 Research and development [Member]	Oct. 31, 2013 General and administrative [Member]	Oct. 31, 2012 General and administrative [Member]	Oct. 31, 2013 New Program [Member]	Nov. 30, 2013 Dividend Declared [Member]
Stockholders' Equity (Textuals)
Common stock repurchased, share		17,600,000		1,700,000
Common stock repurchased, value		$ 1,400,000,000		$ 100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount															2,000,000,000
Accelerated share repurchase program, amount to be repurchased	1,400,000,000
Initial amount paid under accelerated share repurchase agreement	(1,400,000,000)
Stock repurchased under the agreement	17,600,000
Common Stock, Dividends, Per Share, Cash Paid		$ 0.19
Dividends declared per common share (in dollars per share)		$ 0.19		$ 0.17
Payments of dividends		55,000,000		50,000,000
Dividends Payable, Amount Per Share																$ 0.19
Share-based compensation expense from discontinued operations				3,000,000
Total share-based compensation expense
Allocated Share-based Compensation Expense		47,000,000		46,000,000			2,000,000	2,000,000	15,000,000	16,000,000	14,000,000	13,000,000	16,000,000	15,000,000
Income tax benefit		(15,000,000)		(15,000,000)
Decrease in net income		32,000,000		31,000,000
Decrease in net income per share:
Basic (dollars per share)		$ 0.11		$ 0.10
Diluted (dollars per share)		$ 0.11		$ 0.10
Share-based awards available for grant
Shares Available for Grant, Beginning Balance		12,120,000
Options granted		(25,000)
Restricted stock units granted		(740,000)	[1]
Share-based awards canceled/forfeited/expired		2,559,000	[1],[2]
Shares Available for Grant, Ending Balance		13,914,000
Pool Shares Reduced For Each Share Granted		2.3
Pool Shares Increased For Each Share Forfeited		2.3
Summary of stock option activity
Number of shares, Beginning Balance		14,206,000
Weighted average exercise price per share, Beginning Balance		$ 43.77
Options granted, number of shares		25,000
Options granted, weighted average exercise price per share		$ 64.45
Options exercised, number of shares		(1,864,000)
Options exercised, weighted average exercise price per share		$ 37.11
Options canceled or expired, number of shares		(335,000)
Options canceled or expired, weighted average exercise price per share		$ 53.14
Number of shares, Ending Balance		12,032,000
Weighted average exercise price per share, Ending Balance		$ 44.59
Exercisable		7,295,000
Weighted average exercise price per share, Exercisable		$ 36.34
Unrecognized compensation cost related to non-vested share based compensation expense					$ 48,000,000	$ 308,000,000
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years					2 years 1 month 6 days	2 years 4 months 24 days
Summary of restricted stock unit activity
Nonvested at beginning of period		9,184,000
Nonvested, Weighted Average Grant Date Fair Value, at beginning of period		$ 55.23
Granted, Number of shares		322,000
Granted, Weighted Average Grant Date Fair Value		$ 64.86
Restricted stock units assumed or granted in connection with acquisitions, Number of shares		656,000
Restricted stock units assumed or granted in connection with acquisitions, Weighted Average Grant Date Fair Value		$ 69.48
Vested, Number of Shares		(679,000)
Vested, Weighted Average Grant Date Fair Value		$ 47.44
Forfeited, Number of Shares		(1,013,000)
Forfeited, Weighted Average Grant Date Fair Value		$ 64.50
Nonvested at end of period		8,470,000
Nonvested, Weighted Average Grant Date Fair Value, at end of period		$ 56.21

[1] Under the terms of our Amended and Restated 2005 Equity Incentive Plan, as amended through July 24, 2012 (2005 Equity Incentive Plan), RSUs granted from the pool of shares available for grant on or after November 1, 2010 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.