CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	Total	Executive	Greif, Inc. Equity	Greif, Inc. Equity Executive	Capital Stock	Capital Stock Executive	Treasury Stock	Treasury Stock Executive	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non controlling Interests
Beginning balance (shares) at Oct. 31, 2020					48,450		28,392
Beginning balance at Oct. 31, 2020	$ 1,200.7		$ 1,152.2		$ 170.2		$ (134.4)		$ 1,543.9	$ (427.5)	$ 48.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30.9		23.4						23.4		7.5
Other comprehensive income (loss):
Foreign currency translation	27.6		25.0							25.0	2.6
Derivative financial instruments, net of income tax expense/benefit	1.9		1.9							1.9
Minimum pension liability adjustment, net of income tax expense/benefit	22.7		22.7							22.7
Comprehensive income	83.1		73.0
Current period mark to redemption value of redeemable noncontrolling interest and other	0.6		0.6						0.6
Net income allocated to redeemable noncontrolling interests	(0.3)										(0.3)
Dividends paid to Greif, Inc. shareholders	(25.9)		(25.9)						(25.9)
Dividends paid to noncontrolling interests and other	(1.0)										(1.0)
Long-term incentive shares issued (shares)					80		(80)
Long-term incentive shares issued	4.1		4.1		$ 3.9		$ 0.2
Share based compensation	1.2		1.2		$ 1.2
Restricted stock (shares)						3		(3)
Restricted stock		$ 0.1		$ 0.1		$ 0.1		$ 0.0
Ending balance (shares) at Jan. 31, 2021					48,533		28,309
Ending balance at Jan. 31, 2021	1,262.6		1,205.3		$ 175.4		$ (134.2)		1,542.0	(377.9)	57.3
Beginning balance (shares) at Oct. 31, 2021					48,559		28,283
Beginning balance at Oct. 31, 2021	1,575.6		1,514.3		$ 179.3		$ (134.1)		1,825.6	(356.5)	61.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18.6		10.3						10.3		8.3
Other comprehensive income (loss):
Foreign currency translation	(31.5)		(27.2)							(27.2)	(4.3)
Derivative financial instruments, net of income tax expense/benefit	11.8		11.8							11.8
Minimum pension liability adjustment, net of income tax expense/benefit	3.1		3.1							3.1
Comprehensive income	2.0		(2.0)
Current period mark to redemption value of redeemable noncontrolling interest and other	5.0		5.0						5.0
Net income allocated to redeemable noncontrolling interests	0.4										0.4
Dividends paid to Greif, Inc. shareholders	(27.2)		(27.2)						(27.2)
Dividends paid to noncontrolling interests and other	(1.7)										(1.7)
Dividends earned on RSU shares	(0.8)		(0.8)						(0.8)
Long-term incentive shares issued (shares)					46		(46)
Long-term incentive shares issued	2.8		2.8		$ 2.7		$ 0.1
Share based compensation	1.1		1.1		$ 1.1
Restricted stock (shares)						3		(3)
Restricted stock		$ 0.1		$ 0.1		$ 0.1
Ending balance (shares) at Jan. 31, 2022					48,608		28,234
Ending balance at Jan. 31, 2022	$ 1,557.3		$ 1,493.3		$ 183.2		$ (134.0)		$ 1,812.9	$ (368.8)	$ 64.0