EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020
Numerator for basic and diluted EPS
Net income attributable to Greif, Inc.	$ 376.7	$ 390.7	$ 108.8
Cash dividends	(111.3)	(105.8)	(104.3)
Undistributed net income attributable to Greif, Inc.	$ 265.4	$ 284.9	$ 4.5
Class A common stock
Denominator for basic EPS
Denominator for basic EPS (shares)	26,251,536	26,525,529	26,382,838
Denominator for diluted EPS
Denominator for diluted EPS (shares)	26,610,712	26,659,221	26,390,643
EPS Basic
EPS Basic (usd per share)	$ 6.36	$ 6.57	$ 1.83
EPS Diluted
EPS Diluted (usd per share)	$ 6.30	$ 6.54	$ 1.83
Class B common stock
Denominator for basic EPS
Denominator for basic EPS (shares)	21,995,865	22,007,725	22,007,725
Denominator for diluted EPS
Denominator for diluted EPS (shares)	21,995,865	22,007,725	22,007,725
EPS Basic
EPS Basic (usd per share)	$ 9.53	$ 9.84	$ 2.74
EPS Diluted
EPS Diluted (usd per share)	$ 9.53	$ 9.84	$ 2.74