Share-Based Compensation Expense (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jan. 31, 2013	Oct. 31, 2012
Summary of stock option activity
Shares Underlying Options Outstanding, Beginning Balance	3,207
Shares Underlying Options Outstanding, Granted	0
Shares Underlying Options Outstanding, Exercised	(19)
Shares Underlying Options Outstanding, Canceled	(626)
Shares Underlying Options Outstanding, Ending Balance	2,562
Weighted Average Exercise Price (in dollars per share)	$ 26.79	$ 27.58
Weighted Average Exercise Price, Granted (in dollars per share)	$ 0.00
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 7.51
Weighted Average Exercise Price, Canceled (in dollars per share)	$ 31.46