Earnings (Loss) Per Share Calculation (Details 1) In Thousands, unless otherwise specified	12 Months Ended									12 Months Ended
Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009	Oct. 31, 2011 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Apr. 10, 2006 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Oct. 31, 2011 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Mar. 15, 2010 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Oct. 31, 2011 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Jun. 11, 2007 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Oct. 31, 2011 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Oct. 18, 2010 3.75% Convertible Senior Notes due October 15, 2018 [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, 2009 Shares underlying stock options, restricted stock units and warrants [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, 2009 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [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, 2009 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [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, 2009 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [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]	Oct. 31, 2009 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	60,470	40,281	28,949									6,141	7,397	8,302	5,470	7,454	7,539	18,395	11,605	0	13,108	13,108	13,108	17,356	717	0
Interest on convertible notes				0.25%	0.25%	4.00%	4.00%	0.875%	0.875%	3.75%	3.75%

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 171

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 13, 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

+ Details