Post Retirement Benefit Plans - Health Care And Life Insurance Benefits (Details) - Other Postretirement Benefits Plan - Participant	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Retirees and beneficiaries (participant)	653	704
Active participants (participant)	20	22
South Africa | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Retirees and beneficiaries (participant)	86	88
Active participants (participant)	8	10
United States
Defined Benefit Plan Disclosure [Line Items]
Retirees and beneficiaries (participant)	567	616
Active participants (participant)	12	12