Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning Balance Value at Oct. 31, 2008	$ 998,949	$ 905	$ 5,629,498	$ (1,275)	$ (4,630,179)
Beginning Balance Shares at Oct. 31, 2008		90,470,803
Net loss	(581,154)				(581,154)
Changes in unrealized gains and losses on investments, net	1,404			1,404
Translation adjustment	1,094			1,094
Comprehensive loss	(578,656)
Exercise of stock options, net shares	107,000	1,567,557
Exercise of stock options, net	1,107	15	1,092
Share-based compensation expense	34,438		34,438
Ending Balance Value at Oct. 31, 2009	455,838	920	5,665,028	1,223	(5,211,333)
Ending Balance Shares at Oct. 31, 2009		92,038,360
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)
Exercise of stock options, net shares	103,000	2,021,940
Exercise of stock options, net	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	94,060,300
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)
Exercise of stock options, net shares	411,000	3,380,136
Exercise of stock options, net	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