Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net loss	$ (29,817)	$ (31,450)	$ (105,250)	$ (173,192)
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(40)	3	(119)	378
Change in unrealized gain on foreign currency forward contracts, net of tax	(214)	(88)	22	87
Change in accumulated translation adjustments	(2,250)	(4,290)	(4,462)	903
Total comprehensive loss	$ (32,321)	$ (35,825)	$ (109,809)	$ (171,824)