ACQUISITIONS AND DIVESTITURES - Pro forma (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Oct. 31, 2024	Oct. 31, 2023
Ipackchem Acquisition
Business Acquisition [Line Items]
Pro forma net sales	$ 5,537.0	$ 5,439.5
Pro forma net income attributable to Greif, Inc.	$ 289.0	354.6
Lee Container Acquisition
Business Acquisition [Line Items]
Pro forma net sales		5,276.5
Pro forma net income attributable to Greif, Inc.		$ 361.0
Class A common stock \| Ipackchem Acquisition
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 5.01	$ 6.14
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	4.98	6.07
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)		6.25
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)		6.18
Class B common stock \| Ipackchem Acquisition
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	7.50	9.20
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 7.50	9.20
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)		9.36
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)		$ 9.36

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
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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

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