EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Numerator for basic and diluted EPS –
Net income attributable to Greif	$ 390.7	$ 108.8	$ 171.0
Cash dividends	(105.8)	(104.3)	(104.0)
Undistributed net income attributable to Greif, Inc.	$ 284.9	$ 4.5	$ 67.0
Class A common stock
Denominator for basic EPS –
Denominator for basic EPS (shares)	26,525,529	26,382,838	26,189,445
Denominator for diluted EPS –
Denominator for diluted EPS (shares)	26,659,221	26,390,643	26,215,111
EPS Basic
EPS Basic (usd per share)	$ 6.57	$ 1.83	$ 2.89
EPS Diluted
EPS Diluted (usd per share)	$ 6.54	$ 1.83	$ 2.89
Class B common stock
Denominator for basic EPS –
Denominator for basic EPS (shares)	22,007,725	22,007,725	22,007,725
Denominator for diluted EPS –
Denominator for diluted EPS (shares)	22,007,725	22,007,725	22,007,725
EPS Basic
EPS Basic (usd per share)	$ 9.84	$ 2.74	$ 4.33
EPS Diluted
EPS Diluted (usd per share)	$ 9.84	$ 2.74	$ 4.33