SHORT-TERM AND LONG-TERM DEBT (Details 3) - USD ($) $ in Thousands	Jul. 31, 2017	Oct. 31, 2016
Debt Instrument [Line Items]
Net Carrying Value	$ 393,674	$ 486,303
3.75% Convertible Senior Notes due October 15, 2018 | Convertible notes payable
Debt Instrument [Line Items]
Principal Balance	350,000
Unamortized Debt Discount	0
Deferred Debt Issuance Costs	(1,443)
Net Carrying Value	348,557
Equity component, Net carrying amount	0
4.0% Convertible Senior Notes due December 15, 2020 | Convertible notes payable
Debt Instrument [Line Items]
Principal Balance	203,996
Unamortized Debt Discount	(9,893)
Deferred Debt Issuance Costs	(1,032)
Net Carrying Value	193,071
Equity component, Net carrying amount	$ 43,131