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ACQUISITIONS AND DIVESTITURES - Pro Forma Results (Details) - Ipackchem Acquisition - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2024
Jul. 31, 2024
Business Combination [Line Items]    
Pro forma net sales $ 1,454.2 $ 4,120.0
Pro forma net income attributable to Greif, Inc. $ 87.1 $ 224.3
Class A Common Stock    
Business Combination [Line Items]    
Basic earnings per share attributable to Greif, Inc. common shareholders (in usd per share) $ 1.51 $ 3.89
Diluted earnings per share attributable to Greif, Inc. common shareholders (in usd per share) 1.50 3.88
Class B Common Stock    
Business Combination [Line Items]    
Basic earnings per share attributable to Greif, Inc. common shareholders (in usd per share) 2.26 5.83
Diluted earnings per share attributable to Greif, Inc. common shareholders (in usd per share) $ 2.26 $ 5.83