Earnings (Loss) Per Share Calculation (Details 1) In Thousands, unless otherwise specified	12 Months Ended																	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2012 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Aug. 13, 2012 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2011 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2010 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2012 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Aug. 13, 2012 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2011 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2010 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2012 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2011 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2010 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2012 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Oct. 31, 2011 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Oct. 31, 2010 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Oct. 31, 2012 Shares underlying stock options, restricted stock units and warrants [Member]	Oct. 31, 2011 Shares underlying stock options, restricted stock units and warrants [Member]	Oct. 31, 2010 Shares underlying stock options, restricted stock units and warrants [Member]	Oct. 31, 2012 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2011 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2010 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2012 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2011 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2010 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2012 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2011 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2010 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2012 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Oct. 31, 2011 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Oct. 31, 2010 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	60,054	60,470	40,281															5,726	6,141	7,397	5,470	5,470	7,454	18,395	18,395	11,605	13,108	13,108	13,108	17,355	17,356	717
Interest rate on convertible notes				0.25%	0.25%	0.25%	0.25%	4.00%	4.00%	4.00%	4.00%	0.875%	0.875%	0.875%	3.75%	3.75%	3.75%