ACQUISITIONS AND DIVESTITURES - Pro forma (Details) - Lee Container Acquisition - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Oct. 31, 2023	Oct. 31, 2022
Pro forma net sales	$ 5,276.5	$ 6,607.6
Pro forma net income attributable to Greif, Inc.	$ 361.0	$ 380.5
Class A common stock
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 6.25	$ 6.42
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	6.18	6.36
Class B common stock
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	9.36	9.62
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 9.36	$ 9.62

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.

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
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-SubTopic 10
-Topic 805
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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

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