ACQUISITIONS AND DIVESTITURES - Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Ipackchem Acquisition
Business Acquisition [Line Items]
Pro forma net sales	$ 1,454.2	$ 1,383.1	$ 4,120.0	$ 4,076.5
Pro forma net income attributable to Greif, Inc.	$ 87.1	98.8	$ 224.3	289.2
Lee Container Acquisition
Business Acquisition [Line Items]
Pro forma net sales		1,330.2		3,968.0
Pro forma net income attributable to Greif, Inc.		$ 86.0		$ 298.4
Class A Common Stock \| Ipackchem Acquisition
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 1.51	$ 1.72	$ 3.89	$ 5.00
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	1.50	1.69	3.88	4.95
Class A Common Stock \| Lee Container Acquisition
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)		1.50		5.16
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)		1.48		5.11
Class B Common Stock \| Ipackchem Acquisition
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	2.26	2.58	5.83	7.49
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 2.26	2.58	$ 5.83	7.49
Class B Common Stock \| Lee Container Acquisition
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)		2.24		7.72
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)		$ 2.24		$ 7.72

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gef_IpackchemAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gef_LeeContainerCorporationInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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