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DEBT Facility (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2019
USD ($)
Apr. 30, 2019
USD ($)
Line of Credit Facility [Line Items]    
Document Period End Date   Apr. 30, 2019
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Facility, Description   On February 15, 2017, we entered into an amended and restated credit agreement (the “Revolving Credit Facility”) that replaced our existing $450 million unsecured credit facility dated September 15, 2014. The Revolving Credit Facility provides for a $450 million, five-year unsecured revolving credit facility that will expire on February 15, 2022 and bears interest at an annual rate of LIBOR + 1.30%. In addition, the Revolving Credit Facility permits us to increase the total commitments under this credit facility by up to $150 million in the aggregate on one or more occasions upon request. We may use amounts borrowed under the facility for general corporate purposes. As of April 30, 2019, we had no borrowings outstanding under the Revolving Credit Facility. We were in compliance with the covenants of the Revolving Credit Facility during the six months ended April 30, 2019.
Debt Instrument, Term   5 years
Facility, Initiation Date Feb. 15, 2017  
Facility, Maximum Borrowing Capacity $ 450 $ 450
Facility, Expiration Date   Feb. 15, 2022
Debt Instrument, Description of Variable Rate Basis   LIBOR + 1.30%
Additional drawings on credit facility   $ 150
Facility, Outstanding $ 0 $ 0
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate   1.30%