EARNINGS PER SHARE (Tables)

6 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Computation of Class Based Basic and Diluted Earnings Per Share

The Company calculates EPS as follows:

Basic Class A EPS	=	40% * Average Class A Shares Outstanding	*	Undistributed Net Income	+	Class A Dividends Per Share
		40% * Average Class A Shares Outstanding + 60% * Average Class B Shares Outstanding		Average Class A Shares Outstanding
Diluted Class A EPS	=	40% * Average Class A Shares Outstanding	*	Undistributed Net Income	+	Class A Dividends Per Share
		40% * Average Class A Shares Outstanding + 60% * Average Class B Shares Outstanding		Average Diluted Class A Shares Outstanding
Basic Class B EPS	=	60% * Average Class B Shares Outstanding	*	Undistributed Net Income	+	Class B Dividends Per Share
		40% * Average Class A Shares Outstanding + 60% * Average Class B Shares Outstanding		Average Class B Shares Outstanding

         *Diluted Class B EPS calculation is identical to Basic Class B calculation

Schedule of Computation of Earnings Per Share Basic and Diluted

The following table provides EPS information for each period, respectively:

	Three Months Ended March 31,				Six Months Ended March 31,
(in millions)	2026		2025		2026		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.	—		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)

Schedule of Company's Class A and Class B Common and Treasury Shares

The following table summarizes the shares of the Company’s Class A and Class B Common Stock as of the specified dates:

	Authorized Shares	Issued Shares	Outstanding Shares	Treasury Shares
March 31, 2026
Class A Common Stock	128,000,000	42,281,920	24,776,629	17,505,291
Class B Common Stock	69,120,000	34,560,000	21,391,398	13,168,602
September 30, 2025
Class A Common Stock	128,000,000	42,281,920	26,169,944	16,111,976
Class B Common Stock	69,120,000	34,560,000	21,331,127	13,228,873

Schedule of Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share

The following is a reconciliation of the shares used to calculate basic and diluted earnings per share:

	Three Months Ended March 31,		Six Months Ended March 31,
	2026	2025	2026	2025
Class A Common Stock:
Basic shares	24,723,479	26,078,625	25,211,171	25,964,448
Assumed conversion of restricted shares	—	—	406,281	—
Diluted shares	24,723,479	26,078,625	25,617,452	25,964,448
Class B Common Stock:
Basic and diluted shares	21,485,063	21,331,127	21,400,064	21,331,127