Share-Based Compensation Expense (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Jul. 31, 2012	Oct. 31, 2011
Summary of stock option activity
Shares Underlying Options Outstanding, Beginning Balance	3,690
Shares Underlying Options Outstanding, Granted	0
Shares Underlying Options Outstanding, Exercised	(40)
Shares Underlying Options Outstanding, Canceled	(329)
Shares Underlying Options Outstanding, Ending Balance	3,321
Weighted Average Exercise Price (in dollars per share)	$ 27.66	$ 30.01
Weighted Average Exercise Price, Granted (in dollars per share)	$ 0.00
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 5.78
Weighted Average Exercise Price, Canceled (in dollars per share)	$ 56.67