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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
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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% |

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- Definition Defined benefit plan assumptions used calculating benefit obligation and net periodic pension costs discount rate. + References No definition available. + Details
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- Definition Pension plans, postretirement and other employee benefits. + References No definition available. + Details
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