ACQUISITIONS AND DIVESTITURES - Pro forma (Details) - Ipackchem Acquisition - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Business Combination [Line Items]
Pro forma net sales	$ 4,443.8	$ 4,396.2
Pro forma net income from continuing operations attributable to Greif, Inc.	$ 256.1	$ 276.0
Class A common stock
Business Combination [Line Items]
Basic earnings per share from continuing operations attributable to Greif, Inc. common shareholders (in usd per share)	$ 4.44	$ 4.78
Diluted earnings per share from continuing operations attributable to Greif, Inc. common shareholders (in usd per share)	4.42	4.73
Class B common stock
Business Combination [Line Items]
Basic earnings per share from continuing operations attributable to Greif, Inc. common shareholders (in usd per share)	6.65	7.16
Diluted earnings per share from continuing operations attributable to Greif, Inc. common shareholders (in usd per share)	$ 6.65	$ 7.16