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EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Numerator for basic and diluted EPS
Net income from continuing operations attributable to Greif, Inc.	$ 39.3	$ 78.0	$ 58.4	$ 186.5
Net income from discontinued operations attributable to Greif, Inc.	24.7	9.1	61.5	12.2
Net income attributable to Greif, Inc.	64.0	87.1	119.9	198.7
Cash dividends	(31.4)	(30.1)	(93.8)	(89.8)
Undistributed earnings attributable to Greif, Inc.	$ 32.6	$ 57.0	$ 26.1	$ 108.9

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