Post Retirement Benefit Plans - Health Care And Life Insurance Benefits (Details) - Other Postretirement Benefits Plan - Participant	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Retirees and beneficiaries (participant)	625	653
Active participants (participant)	12	20
South Africa | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Retirees and beneficiaries (participant)	83	86
Active participants (participant)	7	8
United States
Defined Benefit Plan Disclosure [Line Items]
Retirees and beneficiaries (participant)	542	567
Active participants (participant)	5	12