Earnings (Loss) Per Share Calculation (Details 1) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended								3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013 0.25% Convertible Senior Notes due May 1, 2013 [Member]	May 02, 2013 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Jul. 31, 2013 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Jul. 31, 2013 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Jul. 31, 2013 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Jul. 31, 2013 4.0% Convertible Senior Notes due December 15, 2020 [Member]	Jul. 31, 2013 Shares Underlying Stock Options and Restricted Units [Member]	Jul. 31, 2012 Shares Underlying Stock Options and Restricted Units [Member]	Jul. 31, 2013 Shares Underlying Stock Options and Restricted Units [Member]	Jul. 31, 2012 Shares Underlying Stock Options and Restricted Units [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 0.25% Convertible Senior Notes due May 1, 2013 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due March 15, 2015 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 0.875% Convertible Senior Notes due June 15, 2017 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 3.75% Convertible Senior Notes due October 15, 2018 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due December 15, 2020 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due December 15, 2020 [Member]	Jul. 31, 2013 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due December 15, 2020 [Member]	Jul. 31, 2012 Convertible Senior Notes [Member] 4.0% Convertible Senior Notes due December 15, 2020 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	52,459	59,624	56,167	60,011							3,599	5,294	3,727	5,681	0	5,470	3,580	5,470	9,198	18,396	10,990	18,396	13,108	13,108	13,108	13,108	17,356	17,356	17,356	17,356	9,198	0	7,406	0
Interest rate on convertible notes					0.25%	0.25%	4.00%	0.875%	3.75%	4.00%