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v3.20.1

LEASES - Additional Information (Details) | 6 Months Ended
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Apr. 30, 2020
Minimum |
Leases [Abstract] |
Term of contract | 1 year
Lessee, Lease, Description [Line Items] |
Term of contract | 1 year
Maximum |
Leases [Abstract] |
Term of contract | 22 years
Lessee, Lease, Description [Line Items] |
Term of contract | 22 years

X
- Definition Lessee, Term Of Contract + References No definition available. + Details
Name: | gef_LesseeTermOfContract
Namespace Prefix: | gef_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |