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Earnings Per Share - Computation of Class Based Basic and Diluted Earnings Per Share (Detail) | 12 Months Ended
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Oct. 31, 2018
Class A Common Stock |
Class of Stock [Line Items] |
Basic and Diluted EPS, class based | 40.00%
Class B Common Stock |
Class of Stock [Line Items] |
Basic and Diluted EPS, class based | 60.00%

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- Definition Percentage of shares outstanding used in two class method calculation. + References No definition available. + Details
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Namespace Prefix: | gef_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |