Short-Term and Long-Term Debt - Net Carrying Values of Convertible Debt (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017	Aug. 02, 2017	Dec. 27, 2012	Oct. 18, 2010
3.75% Convertible Senior Notes due October 15, 2018
Debt Instrument [Line Items]
Interest rate	3.75%
3.75% Convertible Senior Notes due October 15, 2018 (New)
Debt Instrument [Line Items]
Interest rate	3.75%
4.0% Convertible Senior Notes due December 15, 2020
Debt Instrument [Line Items]
Interest rate	4.00%
Convertible Notes Payable
Debt Instrument [Line Items]
Net carrying value	$ 0	$ 543,009
Convertible Notes Payable | 3.75% Convertible Senior Notes due October 15, 2018
Debt Instrument [Line Items]
Net carrying value	0	61,071
Interest rate					3.75%
Convertible Notes Payable | 3.75% Convertible Senior Notes due October 15, 2018 (New)
Debt Instrument [Line Items]
Net carrying value	0	287,221
Interest rate			3.75%
Convertible Notes Payable | 4.0% Convertible Senior Notes due December 15, 2020
Debt Instrument [Line Items]
Net carrying value	$ 0	$ 194,717
Interest rate				4.00%