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DEBT Credit Facility (Details)
 9 Months Ended
Jul. 31, 2016
USD ($)
Jul. 31, 2016
GBP (£)
Oct. 31, 2015
USD ($)
Jul. 21, 2015
USD ($)
Unsecured Credit facility [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Borrowing Capacity, Description
On September 15, 2014, we entered into a five year credit agreement, which provides for a $300 million unsecured credit facility that will expire on November 1, 2019. On July 21, 2015, the total amount available under the credit facility was increased to $450 million. The company may use amounts borrowed under the facility for general corporate purposes.
      
Line of Credit Facility, Initiation Date Sep. 15, 2014      
Line of Credit Facility, Maximum Borrowing Capacity $ 300,000,000      
Line of Credit Facility, Expiration Date Nov. 01, 2019      
Line of Credit Facility, Accession Agreement Date Jul. 21, 2015      
Line of Credit Facility, Current Borrowing Capacity $ 450,000,000      
Line of Credit Facility, Revised Maximum Borrowing Capacity       $ 450,000,000
Line of Credit Facility, Outstanding $ 0      
Bank Overdrafts [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Borrowing Capacity, Description
As a result of the Anite acquisition, we have an overdraft facility of £25 million that expired on July 31, 2016, but by mutual agreement this facility continues to be available while a replacement short-term facility is negotiated. As of July 31, 2016, we had no borrowings outstanding under the facility.
      
Line of Credit Facility, Maximum Borrowing Capacity | £   £ 25,000,000    
Line of Credit Facility, Expiration Date Jul. 31, 2016      
Line of Credit Facility, Outstanding $ 0      
Letter of Credit [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Outstanding $ 16,000,000   $ 19,000,000