Consolidated Statements of Changes in Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance Value at Oct. 31, 2009	$ 455,838	$ 920	$ 5,665,028	$ 1,223	$ (5,211,333)
Beginning Balance Shares at Oct. 31, 2009		92,038,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(333,514)				(333,514)
Changes in unrealized gains and losses on investments, net	(458)			(458)
Translation adjustment	297			297
Comprehensive loss	(333,675)
Issuance of shares from employee equity plans (in shares)	103,000	2,021,940
Issuance of shares from employee equity plans	1,570	21	1,549
Share-based compensation expense	35,560		35,560
Ending Balance Value at Oct. 31, 2010	159,293	941	5,702,137	1,062	(5,544,847)
Ending Balance Shares at Oct. 31, 2010		94,060,300
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(195,521)				(195,521)
Changes in unrealized gains and losses on investments, net	393			393
Translation adjustment	(1,424)			(1,424)
Comprehensive loss	(196,552)
Issuance of shares from employee equity plans (in shares)	411,000	3,380,136
Issuance of shares from employee equity plans	13,202	33	13,169
Share-based compensation expense	37,930		37,930
Ending Balance Value at Oct. 31, 2011	13,873	974	5,753,236	31	(5,740,368)
Ending Balance Shares at Oct. 31, 2011	97,440,436	97,440,436
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(144,021)				(144,021)
Changes in unrealized gains and losses on investments, net	(166)			(166)
Changes in unrealized gains and losses on foreign currency contracts, net	49			49
Translation adjustment	(3,268)			(3,268)
Comprehensive loss	(147,406)
Issuance of shares from employee equity plans (in shares)	56,000	3,161,356
Issuance of shares from employee equity plans	12,167	32	12,135
Share-based compensation expense	32,394		32,394
Ending Balance Value at Oct. 31, 2012	$ (88,972)	$ 1,006	$ 5,797,765	$ (3,354)	$ (5,884,389)
Ending Balance Shares at Oct. 31, 2012	100,601,792	100,601,792