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EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Numerator for basic and diluted EPS
Net income from continuing operations attributable to Greif, Inc.	$ 12.6	$ 18.6	$ 189.2	$ 25.2
Net income (loss) from discontinued operations attributable to Greif, Inc.	0.0	21.3	(2.0)	36.7
Net income attributable to Greif, Inc.	12.6	39.9	187.2	61.9
Dividends declared	(31.9)	(31.4)	(63.6)	(62.4)
Undistributed earnings attributable to Greif, Inc.	$ (19.3)	$ 8.5	$ 123.6	$ (0.5)

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