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Post Retirement Benefit Plans - Actuarial Assumptions Used for the Measurement of Benefit Obligations and Pension Costs (Details) - Other Postretirement Benefits Plan | Oct. 31, 2019 | Oct. 31, 2018
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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 | 3.52% | 5.02%
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 | 2.95% | 4.39%
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 | 9.20% | 10.10%

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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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |