ACQUISITIONS AND DIVESTITURES - Pro forma (Details) - Lee Container Acquisition - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Business Acquisition [Line Items]
Pro forma net sales	$ 1,326.2	$ 1,738.9	$ 2,637.8	$ 3,363.2
Pro forma net income attributable to Greif, Inc.	$ 113.1	$ 130.6	$ 216.3	$ 140.4
Class A Common Stock
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 1.95	$ 2.19	$ 3.73	$ 2.36
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	1.93	2.18	3.70	2.35
Class B Common Stock
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	2.92	3.29	5.58	3.53
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 2.92	$ 3.29	$ 5.58	$ 3.53

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.

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