Employee Benefit Plans (Equity Compensation Plans - 2006 Employee Equity Incentive Plan) (Narrative) (Details)									0 Months Ended
	Oct. 31, 2011 years		Oct. 31, 2010 years		Oct. 31, 2009 years		Oct. 31, 2008 years		Mar. 24, 2011 2006 Employee Equity Incentive Plan [Member]	Oct. 31, 2011 2006 Employee Equity Incentive Plan [Member]	Oct. 31, 2011 All Stock Plans [Member]	Oct. 31, 2010 All Stock Plans [Member]	Oct. 31, 2009 All Stock Plans [Member]	Oct. 31, 2008 All Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional reserved for future issuance under the 2006 Employee Plan									7.0
Weighted-average remaining contractual life (in years)	2.97		2.80		2.89		3.43			7
Aggregate stock options outstanding											15,960,000	21,184,000	25,818,000	28,777,000
Shares available for future grant	5,911,000	[1]	2,606,000	[1]	6,703,000	[1]	4,347,000	[1]
Number of shares available contingent upon cancellation or expiration of prior plans										6,400,000

[1] Excluding shares reserved for future issuance under the 2005 Directors Plan.