Earnings (Loss) Per Share Calculation (Details 1) In Thousands, unless otherwise specified	3 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	52,271	59,552
0.25% Convertible Senior Notes due May 1, 2013 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate on convertible notes	0.25%
4.0% Convertible Senior Notes due March 15, 2015 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate on convertible notes	4.00%
0.875% Convertible Senior Notes due June 15, 2017 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate on convertible notes	0.875%
3.75% Convertible Senior Notes due October 15, 2018 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate on convertible notes	3.75%
4.0% Convertible Senior Notes due December 15, 2020 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate on convertible notes	4.00%
Shares Underlying Stock Options and Restricted Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	3,412	5,223
Convertible Senior Notes [Member] | 0.25% Convertible Senior Notes due May 1, 2013 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	0	5,470
Convertible Senior Notes [Member] | 4.0% Convertible Senior Notes due March 15, 2015 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	9,198	14,615
Convertible Senior Notes [Member] | 0.875% Convertible Senior Notes due June 15, 2017 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total excluded due to anti-dilutive effect (in shares)	13,108	13,108
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)	17,355	17,355
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)	9,198	3,781