CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net sales	$ 1,165.6	$ 1,125.9	$ 3,233.2	$ 3,221.0
Cost of products sold	893.0	869.9	2,511.0	2,517.1
Gross profit	272.6	256.0	722.2	703.9
Selling, general and administrative expenses	149.5	168.3	487.3	488.4
Acquisition and integration related costs	1.5	2.0	3.6	6.1
Restructuring and other charges	12.1	18.0	42.0	30.4
Non-cash asset impairment charges	1.4	7.2	6.1	24.7
Loss (gain) on disposal of properties, plants and equipment, net	0.2	(3.5)	(217.2)	(5.8)
Loss on disposal of businesses, net	0.0	0.3	0.5	1.6
Operating profit	107.9	63.7	399.9	158.5
Interest expense, net	7.7	15.8	27.4	47.2
Non-cash pension settlement charges	0.3	0.0	1.9	0.0
Debt extinguishment charges	0.0	0.0	2.5	0.0
Other expense, net	0.0	1.4	4.8	2.5
Income from continuing operations before income tax expense and equity earnings of unconsolidated affiliates, net	99.9	46.5	363.3	108.8
Income tax expense	17.9	10.0	82.7	36.8
Equity earnings of unconsolidated affiliates, net of tax	(0.6)	(0.4)	(1.2)	(1.3)
Net income from continuing operations	82.6	36.9	281.8	73.3
Net income (loss) from discontinued operations, net of tax	(1.0)	24.1	(3.0)	60.8
Net income	81.6	61.0	278.8	134.1
Net income attributable to noncontrolling interests	(3.8)	(6.2)	(13.8)	(17.4)
Net income attributable to Greif, Inc.	$ 77.8	$ 54.8	$ 265.0	$ 116.7
Class A Common Stock
Basic earnings per share attributable to Greif, Inc. common shareholders:
Class A and Class B common stock (continued operations) - basic (in usd per share)	$ 1.39	$ 0.53	$ 4.70	$ 0.96
Class A and Class B common stock (discontinued operations) - basic (in usd per share)	(0.02)	0.41	(0.05)	1.05
Earnings per Class A and Class B common stock - basic (in usd per share)	1.37	0.94	4.65	2.01
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Class A and Class B common stock (continued operations) - diluted (in usd per share)	1.37	0.53	4.64	0.96
Class A and Class B common stock (discontinued operations) - diluted (in usd per share)	(0.02)	0.41	(0.05)	1.05
Earnings per Class A and Class B common stock - diluted (in usd per share)	$ 1.35	$ 0.94	$ 4.59	$ 2.01
Weighted-average number of Class A and Class B common shares outstanding:
Basic (in shares)	24,776,629	26,129,971	25,066,324	26,019,622
Diluted (in shares)	25,492,283	26,129,971	25,575,729	26,019,622
Cash dividends declared per common share:
Cash dividends declared per common share (in usd per share)	$ 0.62	$ 0.54	$ 1.74	$ 1.62
Class B Common Stock
Basic earnings per share attributable to Greif, Inc. common shareholders:
Class A and Class B common stock (continued operations) - basic (in usd per share)	2.08	0.80	7.04	1.44
Class A and Class B common stock (discontinued operations) - basic (in usd per share)	(0.03)	0.62	(0.08)	1.57
Earnings per Class A and Class B common stock - basic (in usd per share)	2.05	1.42	6.96	3.01
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Class A and Class B common stock (continued operations) - diluted (in usd per share)	2.08	0.80	7.04	1.44
Class A and Class B common stock (discontinued operations) - diluted (in usd per share)	(0.03)	0.62	(0.08)	1.57
Earnings per Class A and Class B common stock - diluted (in usd per share)	$ 2.05	$ 1.42	$ 6.96	$ 3.01
Weighted-average number of Class A and Class B common shares outstanding:
Basic (in shares)	21,362,305	21,331,127	21,387,478	21,331,127
Diluted (in shares)	21,362,305	21,331,127	21,387,478	21,331,127
Cash dividends declared per common share:
Cash dividends declared per common share (in usd per share)	$ 0.93	$ 0.81	$ 2.60	$ 2.42