Share-Based Compensation Expense (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified		12 Months Ended						0 Months Ended	12 Months Ended		12 Months Ended			12 Months Ended
	Oct. 31, 2011	Oct. 31, 2011 Stock Options [Member] years	Oct. 31, 2010 Stock Options [Member]	Oct. 31, 2009 Stock Options [Member]	Oct. 31, 2011 Restricted Stock Units (RSUs) [Member] years	Oct. 31, 2010 Restricted Stock Units (RSUs) [Member]	Oct. 31, 2009 Restricted Stock Units (RSUs) [Member]	Apr. 14, 2010 2008 Plan [Member]	Oct. 31, 2011 2008 Plan [Member]	Mar. 26, 2008 2008 Plan [Member]	Oct. 31, 2011 2008 Plan [Member] Stock Options [Member]	Oct. 31, 2011 2008 Plan [Member] Stock Appreciation Rights (SARs) [Member]	Dec. 08, 2009 2010 Plan [Member]	Oct. 31, 2011 2003 Employee Stock Purchase Plan [Member]	Oct. 31, 2011 2003 Employee Stock Purchase Plan [Member] Employee Stock [Member]	Oct. 31, 2010 2003 Employee Stock Purchase Plan [Member] Employee Stock [Member]	Oct. 31, 2009 2003 Employee Stock Purchase Plan [Member] Employee Stock [Member]	Oct. 31, 2011 2003 Employee Stock Purchase Plan [Member] Employee Stock [Member] Prior to October 1, 2010 [Member]	Oct. 31, 2011 2003 Employee Stock Purchase Plan [Member] Employee Stock [Member] Beginning on October 1, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan term (in years)									10 years					10 years
Shares of common stock reserved for future issuance										8,000,000
Awards maximum term (in years)											10 years	10 years
Date of grant exercise price minimum percentage of fair market value											100.00%	100.00%
Number of additional shares authorized								5,000,000
Fungible share ratio used for counting full value awards, prior to amendment								1.6
Fungible share ratio used for counting full value awards, subsequent to amendment								1.31
Remaining authorized shares available for issuance									4,000,000						3,200,000	3,500,000	3,500,000
Shares authorized for issuance under plan													2,250,000	3,600,000
Vesting period of service-based awards		4 years			three or four-year
Maximum number of shares increase under ESPP															600,000
Maximum number of shares which can be added to ESPP for remainder of plan term															2,200,000
Shares issued under ESPP															500,000	100,000	100,000
Unrecognized share-based compensation	$ 59.4	$ 1.0			$ 58.4
Weighted-average period for recognition of share-based compensation (in years)		0.6			1.6
Intrinsic value of option exercised		3.4	0.9	0.7
Weighted average fair value of each stock option granted (per share)			$ 6.94	$ 4.94
Total fair value of restricted stock units vested and converted into common stock					$ 45.3	$ 25.7	$ 14.7
Weighted average fair value of each restricted stock unit granted (per share)					$ 19.73	$ 13.43	$ 7.02
Offer period																		6 months	6 months
ESPP Discount Percentage Purchase Date																		5.00%	15.00%