Share-Based Compensation Expense (Details 2) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Jul. 31, 2015	Oct. 31, 2014
Summary of Restricted Stock Unit Activity
Balance at October 31, 2014 (in shares)	4,012
Granted (in shares)	2,509
Vested (in shares)	(1,572)
Canceled or forfeited (in shares)	(219)
Balance at January 31, 2015 (in shares)	4,730
Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value	$ 18.88	$ 18.02
Aggregate fair value	$ 120,374	$ 67,241