- Post Retirement Benefit Plans - Health Care And Life Insurance Benefits (Details) - Other Postretirement Benefits Plan - Participant	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Active participants (participant)	9	12
Retirees and beneficiaries (participant)	1,065	625
United States
Defined Benefit Plan Disclosure [Line Items]
Active participants (participant)	3	5
Retirees and beneficiaries (participant)	986	542
South Africa
Defined Benefit Plan Disclosure [Line Items]
Active participants (participant)	6	7
Retirees and beneficiaries (participant)	79	83