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Post Retirement Benefit Plans - Actuarial Assumptions Used for the Measurement of Benefit Obligations and Pension Costs (Detail) - Other Postretirement Benefits Plan | Oct. 31, 2018 | Oct. 31, 2017
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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 | 5.02% | 4.12%
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 | 4.39% | 3.44%
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 | 10.10% | 9.80%

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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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Namespace Prefix: | gef_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Pension plans, postretirement and other employee benefits. + References No definition available. + Details
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Namespace Prefix: | gef_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_ZA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |