CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Net sales	$ 1,083.0	$ 1,252.6	$ 3,353.7	$ 3,362.9
Cost of products sold	863.3	973.2	2,670.7	2,662.0
Gross profit	219.7	279.4	683.0	700.9
Selling, general and administrative expenses	120.4	138.9	376.9	377.0
Restructuring charges	19.1	9.1	26.8	20.3
Acquisition and integration related costs	3.6	5.8	13.5	22.2
Non-cash asset impairment charges	15.5	0.0	16.9	2.1
Gain on disposal of properties, plants and equipment, net	(0.3)	(1.3)	(2.1)	(7.1)
(Gain) loss on disposal of businesses, net	(0.5)	1.3	37.9	3.0
Operating profit	61.9	125.6	213.1	283.4
Interest expense, net	29.8	34.5	89.8	80.1
Debt extinguishment charges	0.0	0.1	0.0	22.0
Non-cash pension settlement income	0.0	0.0	(0.1)	0.0
Other (income) expense, net	1.1	(1.1)	3.5	1.0
Income before income tax expense and equity earnings of unconsolidated affiliates, net	31.0	92.1	119.9	180.3
Income tax expense	6.9	26.8	44.8	58.3
Equity earnings of unconsolidated affiliates, net of tax	(0.3)	(2.2)	(1.2)	(2.4)
Net income	24.4	67.5	76.3	124.4
Net income attributable to noncontrolling interests	(3.7)	(4.8)	(11.9)	(18.4)
Net income attributable to Greif, Inc.	$ 20.7	$ 62.7	$ 64.4	$ 106.0
Class A Common Stock
Basic earnings per share attributable to Greif, Inc. common shareholders:
Basic earnings per share attributable to Greif, Inc. common shareholders (usd per share)	$ 0.35	$ 1.06	$ 1.09	$ 1.80
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Diluted earnings per share attributable to Greif, Inc. common shareholders (usd per share)	$ 0.35	$ 1.06	$ 1.09	$ 1.80
Weighted-average number of common shares outstanding:
Weighted-average number of common shares outstanding, basic (shares)	26,441,986	26,257,943	26,363,123	26,166,612
Weighted-average number of common shares outstanding, diluted (shares)	26,442,595	26,257,943	26,363,177	26,166,612
Cash dividends declared per common share:
Cash dividends declared per common share (usd per share)	$ 0.44	$ 0.44	$ 1.32	$ 1.32
Class B Common Stock
Basic earnings per share attributable to Greif, Inc. common shareholders:
Basic earnings per share attributable to Greif, Inc. common shareholders (usd per share)	0.52	1.59	1.62	2.68
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Diluted earnings per share attributable to Greif, Inc. common shareholders (usd per share)	$ 0.52	$ 1.59	$ 1.62	$ 2.68
Weighted-average number of common shares outstanding:
Weighted-average number of common shares outstanding, basic (shares)	22,000,000.0	22,000,000.0	22,000,000.0	22,000,000.0
Weighted-average number of common shares outstanding, diluted (shares)	22,000,000.0	22,000,000.0	22,000,000.0	22,000,000.0
Cash dividends declared per common share:
Cash dividends declared per common share (usd per share)	$ 0.66	$ 0.66	$ 1.97	$ 1.97