CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Net sales	$ 994.8	$ 1,016.7
Cost of products sold	792.2	817.3
Gross profit	202.6	199.4
Selling, general and administrative expenses	146.1	160.2
Acquisition and integration related costs	0.7	2.8
Restructuring and other charges	14.2	3.3
Non-cash asset impairment charges	0.2	0.3
Gain on disposal of properties, plants and equipment, net	(215.7)	(2.4)
Loss on disposal of businesses, net	0.5	1.1
Operating profit	256.6	34.1
Interest expense, net	9.7	15.9
Non-cash pension settlement charges	0.9	0.0
Other expense, net	4.4	0.9
Income from continuing operations before income tax expense and equity earnings of unconsolidated affiliates, net	241.6	17.3
Income tax expense	58.9	6.8
Equity earnings of unconsolidated affiliates, net of tax	(0.2)	(0.8)
Net income from continuing operations	182.9	11.3
Net (loss) income from discontinued operations, net of tax	(2.0)	15.4
Net income	180.9	26.7
Net income attributable to noncontrolling interests	(6.3)	(4.7)
Net income attributable to Greif, Inc.	$ 174.6	$ 22.0
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)	$ 3.07	$ 0.11
Class A and Class B common stock (discontinued operations) - basic (in usd per share)	(0.03)	0.27
Earnings per Class A and Class B common stock - basic (in usd per share)	3.04	0.38
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Earnings from continuing operations per Class A and Class B common stock - diluted (in usd per share)	3.00	0.13
Earnings from discontinued operations per Class A and Class B common stock - diluted (in usd per share)	(0.03)	0.26
Earnings per Class A and Class B common stock - diluted (in usd per share)	$ 2.97	$ 0.39
Weighted-average number of Class A and Class B common shares outstanding:
Basic (in shares)	25,698,863	25,850,270
Diluted (in shares)	26,452,107	26,287,287
Cash dividends declared per common share:
Cash dividends declared per common share (in usd per share)	$ 0.56	$ 0.54
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)	4.60	0.17
Class A and Class B common stock (discontinued operations) - basic (in usd per share)	(0.05)	0.40
Earnings per Class A and Class B common stock - basic (in usd per share)	4.55	0.57
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Earnings from continuing operations per Class A and Class B common stock - diluted (in usd per share)	4.60	0.17
Earnings from discontinued operations per Class A and Class B common stock - diluted (in usd per share)	(0.05)	0.40
Earnings per Class A and Class B common stock - diluted (in usd per share)	$ 4.55	$ 0.57
Weighted-average number of Class A and Class B common shares outstanding:
Basic (in shares)	21,315,064	21,331,127
Diluted (in shares)	21,315,064	21,331,127
Cash dividends declared per common share:
Cash dividends declared per common share (in usd per share)	$ 0.83	$ 0.80