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ACQUISITIONS AND DIVESTITURES - Pro Forma Results (Details) - Ipackchem Acquisition - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2024
Apr. 30, 2024
Business Combination [Line Items]    
Pro forma net sales $ 1,404.3 $ 2,665.7
Pro forma net income attributable to Greif, Inc. $ 54.6 $ 130.2
Class A Common Stock    
Business Combination [Line Items]    
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share) $ 0.94 $ 2.26
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share) 0.94 2.26
Class B Common Stock    
Business Combination [Line Items]    
Basic earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share) 1.42 3.38
Diluted earnings per share attributable to Greif, Inc. common shareholders: (in dollars per share) $ 1.42 $ 3.38