Share-Based Compensation Expense (Details 2) (Restricted Stock Units (RSUs), USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Jul. 31, 2014	Oct. 31, 2013
Restricted Stock Units (RSUs)
Summary of Restricted Stock Unit Activity
Balance at October 31, 2013 (in shares)	4,419
Granted (in shares)	1,819
Vested (in shares)	(1,757)
Canceled or forfeited (in shares)	(127)
Balance at July 31, 2014 (in shares)	4,354
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value Per Share, Beginning Balance (in dollars per share)	$ 15.33
Weighted Average Grant Date Fair Value Per Share, Ending Balance (in dollars per share)	$ 17.90
Aggregate Fair Value	$ 83,173	$ 102,745