EARNINGS PER SHARE - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Numerator for basic and diluted EPS
Net income attributable to Greif, Inc.	$ 62.7	$ 67.7	$ 106.0	$ 169.3
Cash dividends	(26.1)	(24.8)	(77.9)	(74.0)
Undistributed net income (loss) attributable to Greif, Inc.	$ 36.6	$ 42.9	$ 28.1	$ 95.3