SHORT-TERM AND LONG-TERM DEBT (Details 3) - USD ($) $ in Thousands	Apr. 30, 2017	Oct. 31, 2016
Debt Instrument [Line Items]
Net Carrying Amount	$ 393,377	$ 486,303
0.875% Convertible Senior Notes due June 15, 2017 | Convertible notes payable
Debt Instrument [Line Items]
Principal Balance	185,258
Unamortized Discount	0
Deferred Debt Issuance Costs	(37)
Net Carrying Amount	185,221
Equity component, Net carrying amount	0
3.75% Convertible Senior Notes due October 15, 2018 | Convertible notes payable
Debt Instrument [Line Items]
Principal Balance	350,000
Unamortized Discount	0
Deferred Debt Issuance Costs	(1,752)
Net Carrying Amount	348,248
Equity component, Net carrying amount	0
4.0% Convertible Senior Notes due December 15, 2020 | Convertible notes payable
Debt Instrument [Line Items]
Principal Balance	203,093
Unamortized Discount	(10,428)
Deferred Debt Issuance Costs	(1,108)
Net Carrying Amount	191,557
Equity component, Net carrying amount	$ 43,131