CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Net sales	$ 1,158.3	$ 1,213.3	$ 2,270.7	$ 2,110.3
Cost of products sold	917.6	964.6	1,807.4	1,688.8
Gross profit	240.7	248.7	463.3	421.5
Selling, general and administrative expenses	121.1	140.0	256.5	238.1
Restructuring charges	4.4	7.5	7.7	11.2
Acquisition and integration related costs	4.8	13.8	9.9	16.4
Non-cash asset impairment charges	1.3	0.0	1.4	2.1
Gain on disposal of properties, plants and equipment, net	(1.3)	(4.9)	(1.8)	(5.8)
Loss on disposal of businesses, net	38.4	1.7	38.4	1.7
Operating profit	72.0	90.6	151.2	157.8
Interest expense, net	29.3	33.9	60.0	45.6
Debt extinguishment charges	0.0	21.9	0.0	21.9
Non-cash pension settlement income	0.0	0.0	(0.1)	0.0
Other expense, net	1.1	2.3	2.4	2.1
Income before income tax expense and equity earnings of unconsolidated affiliates, net	41.6	32.5	88.9	88.2
Income tax expense	26.5	11.5	37.9	31.5
Equity earnings of unconsolidated affiliates, net of tax	(0.7)	(0.1)	(0.9)	(0.2)
Net income	15.8	21.1	51.9	56.9
Net income attributable to noncontrolling interests	(4.4)	(7.5)	(8.2)	(13.6)
Net income attributable to Greif, Inc.	$ 11.4	$ 13.6	$ 43.7	$ 43.3
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)	$ 0.19	$ 0.23	$ 0.74	$ 0.74
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Diluted earnings per share attributable to Greif, Inc. common shareholders (usd per share)	$ 0.19	$ 0.23	$ 0.74	$ 0.74
Weighted-average number of common shares outstanding:
Weighted-average number of common shares outstanding, basic (shares)	26,386,439	26,250,460	26,323,691	26,120,946
Weighted-average number of common shares outstanding, diluted (shares)	26,386,439	26,255,112	26,323,691	26,122,080
Cash dividends declared per common share:
Cash dividends declared per common share (usd per share)	$ 0.44	$ 0.44	$ 0.88	$ 0.88
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)	0.29	0.34	1.10	1.09
Diluted earnings per share attributable to Greif, Inc. common shareholders:
Diluted earnings per share attributable to Greif, Inc. common shareholders (usd per share)	$ 0.29	$ 0.34	$ 1.10	$ 1.09
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	$ 1.31	$ 1.31