Post Retirement Benefit Plans - Summary of Healthcare Cost Trend Rates on Gross Eligible Charges (Detail) - Pension Plans, Defined Benefit	12 Months Ended
Oct. 31, 2016
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Current trend rate	7.20%
Ultimate trend rate	5.00%
South Africa
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Year ultimate trend rate reached	2018
United States
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Year ultimate trend rate reached	2026

Pension plans, postretirement and other employee benefits.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

+ Details

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