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DEBT (Short-Term Debt - Revolving Credit Facility) (Details) - USD ($)
$ in Millions
 9 Months Ended
Jul. 31, 2020
Oct. 31, 2019
Line of Credit Facility    
Document Period End Date Jul. 31, 2020  
Facility, Covenant Compliance We were in compliance with the covenants of the Revolving Credit Facility during the nine months ended July 31, 2020.  
Revolving Credit Facility    
Line of Credit Facility    
Facility, Description We maintain a credit facility (the “Revolving Credit Facility”) that provides for a $450 million, five-year unsecured revolving credit facility that will expire on February 15, 2022. 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 July 31, 2020 and October 31, 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 nine months ended July 31, 2020.  
Facility, Maximum Borrowing Capacity $ 450  
Facility, Expiration Date Feb. 15, 2022  
Additional drawings on credit facility $ 150  
Facility, Outstanding $ 0 $ 0