ACQUISITIONS AND DIVESTITURES - Pro forma (Details) - Lee Container Acquisition - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Business Acquisition [Line Items]
Pro forma net sales	$ 1,330.2	$ 1,687.2	$ 3,968.0	$ 5,050.4
Pro forma net income attributable to Greif, Inc.	$ 86.0	$ 144.2	$ 298.4	$ 285.7
Class A Common Stock
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 1.50	$ 2.43	$ 5.16	$ 4.80
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	1.48	2.36	5.11	4.63
Class B Common Stock
Business Acquisition [Line Items]
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	2.24	3.65	7.72	7.20
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share)	$ 2.24	$ 3.59	$ 7.72	$ 6.98