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EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Millions
 2 Months Ended 3 Months Ended 10 Months Ended 11 Months Ended 12 Months Ended
Sep. 30, 2025
Jul. 31, 2025
Apr. 30, 2025
Jan. 31, 2025
Oct. 31, 2024
Jul. 31, 2024
Apr. 30, 2024
Jan. 31, 2024
Sep. 30, 2024
Sep. 30, 2025
Oct. 31, 2024
Oct. 31, 2023
Numerator for basic and diluted EPS                        
Net income from continuing operations attributable to Greif, Inc.                   $ 15.1 $ 235.9 $ 280.6
Net income from discontinued operations attributable to Greif, Inc.                   824.9 32.9 78.6
Net income attributable to Greif, Inc. $ 720.1 $ 64.0 $ 47.3 $ 8.6 $ 70.1 $ 87.1 $ 44.4 $ 67.2 $ 243.8 840.0 268.8 359.2
Dividends declared                   (126.4) (121.0) (116.5)
Undistributed net income attributable to Greif, Inc.                   $ 713.6 $ 147.8 $ 242.7
Class A common stock                        
Denominator for basic EPS –                        
Denominator for basic EPS (in shares)                   26,076,015 25,751,386 25,592,928
Denominator for diluted EPS –                        
Denominator for diluted EPS (in shares)                   26,344,952 25,977,401 25,999,231
EPS Basic                        
Common stock (continued operations) - basic (in usd per share) $ (0.74) $ 0.67 $ 0.42 $ (0.08) $ 0.85 $ 1.35 $ 0.80 $ 1.09 $ 3.83 $ 0.27 $ 4.09 $ 4.86
Ccommon stock (discontinued operations) - basic (in usd per share) 13.14 0.43 0.40 0.23 0.36 0.16 (0.03) 0.08 0.40 14.20 0.57 1.36
Earnings per common stock - basic (in usd per share) 12.40 1.10 0.82 0.15 1.21 1.51 0.77 1.17 4.23 14.47 4.66 6.22
EPS Diluted                        
Common stock (continued operations) - diluted (in usd per share) (0.73) 0.67 0.42 (0.08) 0.85 1.34 0.80 1.09 3.81 0.28 4.08 4.81
Common stock (discontinued operations) - diluted (in usd per share) 13.00 0.43 0.40 0.23 0.35 0.16 (0.03) 0.08 0.40 14.06 0.56 1.34
Earnings per common stock - diluted (in usd per share) 12.27 1.10 0.82 0.15 1.20 1.50 0.77 1.17 4.21 $ 14.34 $ 4.64 $ 6.15
Class B common stock                        
Denominator for basic EPS –                        
Denominator for basic EPS (in shares)                   21,331,127 21,331,127 21,472,531
Denominator for diluted EPS –                        
Denominator for diluted EPS (in shares)                   21,331,127 21,331,127 21,472,531
EPS Basic                        
Common stock (continued operations) - basic (in usd per share) (1.13) 1.02 0.62 (0.13) 1.29 2.02 1.19 1.63 5.72 $ 0.38 $ 6.13 $ 7.28
Ccommon stock (discontinued operations) - basic (in usd per share) 19.72 0.64 0.60 0.35 0.53 0.24 (0.04) 0.12 0.61 21.31 0.85 2.04
Earnings per common stock - basic (in usd per share) 18.59 1.66 1.22 0.22 1.82 2.26 1.15 1.75 6.33 21.69 6.98 9.32
EPS Diluted                        
Common stock (continued operations) - diluted (in usd per share) (1.13) 1.02 0.62 (0.13) 1.29 2.02 1.19 1.63 5.72 0.38 6.13 7.28
Common stock (discontinued operations) - diluted (in usd per share) 19.72 0.64 0.60 0.35 0.53 0.24 (0.04) 0.12 0.61 21.31 0.85 2.04
Earnings per common stock - diluted (in usd per share) $ 18.59 $ 1.66 $ 1.22 $ 0.22 $ 1.82 $ 2.26 $ 1.15 $ 1.75 $ 6.33 $ 21.69 $ 6.98 $ 9.32