v3.25.4

EARNINGS PER SHARE - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2025 USD ($) agreement class_of_stock $ / shares shares	Dec. 09, 2025 USD ($)	Dec. 31, 2017 shares
Class of Stock [Line Items]
Number of classes of stock \| class_of_stock	2
Number of open market repurchase agreements \| agreement	2
Board of Director Authorized
Class of Stock [Line Items]
Number of shares authorized to be purchased (in shares)			4,000,000
Number of shares remaining authorized purchased (in shares)	581,148
Class A Common Stock
Class of Stock [Line Items]
Dividend proportions (in usd per share) \| $ / shares	$ 0.01
Percentage of shares outstanding used in two class method calculation	40.00%
Number of open market repurchase agreements \| agreement	1
Class A Common Stock \| Board of Director Authorized
Class of Stock [Line Items]
Share repurchases (in shares)	1,813,600
Class A Common Stock \| Open Market Share Repurchase Plan
Class of Stock [Line Items]
Share repurchase program, authorized, amount \| $	$ 120.0
Class B Common Stock
Class of Stock [Line Items]
Dividend proportions (in usd per share) \| $ / shares	$ 0.015
Percentage of shares outstanding used in two class method calculation	60.00%
Class B Common Stock \| Board of Director Authorized
Class of Stock [Line Items]
Share repurchases (in shares)	110,088
Class B Common Stock \| Open Market Share Repurchase Plan
Class of Stock [Line Items]
Share repurchase program, authorized, amount \| $	$ 30.0
Class B Common Stock \| Board Of Director 2025 Authorized
Class of Stock [Line Items]
Share repurchase program, authorized, amount \| $		$ 300.0

Common Stock, Dividend Proportions, Per Share

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GREIF, INC 10-Q