Post Retirement Benefit Plans - Actuarial Assumptions Used for the Measurement of Benefit Obligations and Pension Costs (Detail)	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs	3.08%	3.71%	3.69%
United States
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs	3.79%	4.37%	4.22%
Postretirement Health Care and Life Insurance Benefits
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs	4.10%	4.65%
Postretirement Health Care and Life Insurance Benefits | United States
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs	3.38%	3.88%
Postretirement Health Care and Life Insurance Benefits | South Africa
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Actuarial assumptions used to measure the year-end benefit obligations and the pension costs	9.50%	9.20%