EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Numerator for basic and diluted EPS
Net income attributable to Greif, Inc.	$ 359.2	$ 376.7	$ 390.7
Cash dividends	(116.5)	(111.3)	(105.8)
Undistributed net income attributable to Greif, Inc.	$ 242.7	$ 265.4	$ 284.9
Class A common stock
Denominator for basic EPS
Denominator for basic EPS (in shares)	25,592,928	26,251,536	26,525,529
Denominator for diluted EPS
Denominator for diluted EPS (in shares)	25,999,231	26,610,712	26,659,221
EPS Basic
EPS Basic (usd per share)	$ 6.22	$ 6.36	$ 6.57
EPS Diluted
EPS Diluted (usd per share)	$ 6.15	$ 6.30	$ 6.54
Class B common stock
Denominator for basic EPS
Denominator for basic EPS (in shares)	21,472,531	21,995,865	22,007,725
Denominator for diluted EPS
Denominator for diluted EPS (in shares)	21,472,531	21,995,865	22,007,725
EPS Basic
EPS Basic (usd per share)	$ 9.32	$ 9.53	$ 9.84
EPS Diluted
EPS Diluted (usd per share)	$ 9.32	$ 9.53	$ 9.84