CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	Total	Executive	Directors	Greif, Inc. Equity	Greif, Inc. Equity Executive	Greif, Inc. Equity Directors	Capital Stock	Capital Stock Executive	Capital Stock Directors	Treasury Stock	Treasury Stock Executive	Treasury Stock Directors	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non controlling interests
Beginning balance (in shares) at Oct. 31, 2021							48,559
Beginning balance at Oct. 31, 2021	$ 1,575.6			$ 1,514.3			$ 179.3			$ (134.1)			$ 1,825.6	$ (356.5)	$ 61.3
Beginning balance (in shares) at Oct. 31, 2021										28,283
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	145.3			135.4									135.4		9.9
Other comprehensive income (loss):
Foreign currency translation	32.6			38.2										38.2	(5.6)
Derivative financial instruments, net of income tax expense/benefit	35.9			35.9										35.9
Minimum pension liability adjustment, net of income tax expense/benefit	6.5			6.5										6.5
Comprehensive income	220.3			216.0
Divestment of noncontrolling interest	(24.4)														(24.4)
Current period mark to redemption value of redeemable noncontrolling interest and other	4.9			4.9									4.9
Net income allocated to redeemable noncontrolling interests	0.1														0.1
Dividends paid to Greif, Inc. shareholders	(54.6)			(54.6)									(54.6)
Dividends paid to noncontrolling interests and other	(9.3)														(9.3)
Dividends earned on RSU shares	(1.0)			(1.0)									(1.0)
Long-term incentive shares issued (in shares)							52			(52)
Long-term incentive shares issued	3.1			3.1			$ 3.0			$ 0.1
Share based compensation	2.4			2.4			$ 2.4
Restricted stock (in shares)								3	22		(3)	(22)
Restricted stock		$ 0.1	$ 1.2		$ 0.1	$ 1.2		$ 0.1	$ 1.2			$ 0.0
Ending balance (in shares) at Apr. 30, 2022							48,636
Ending balance at Apr. 30, 2022	1,718.4			1,686.4			$ 186.0			$ (134.0)			1,910.3	(275.9)	32.0
Ending balance (in shares) at Apr. 30, 2022										28,206
Beginning balance (in shares) at Jan. 31, 2022							48,608
Beginning balance at Jan. 31, 2022	1,557.3			1,493.3			$ 183.2			$ (134.0)			1,812.9	(368.8)	64.0
Beginning balance (in shares) at Jan. 31, 2022										28,234
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126.7			125.1									125.1		1.6
Other comprehensive income (loss):
Foreign currency translation	64.1			65.4										65.4	(1.3)
Derivative financial instruments, net of income tax expense/benefit	24.1			24.1										24.1
Minimum pension liability adjustment, net of income tax expense/benefit	3.4			3.4										3.4
Comprehensive income	218.3			218.0
Divestment of noncontrolling interest	(24.4)														(24.4)
Current period mark to redemption value of redeemable noncontrolling interest and other	(0.1)			(0.1)									(0.1)
Net income allocated to redeemable noncontrolling interests	(0.3)														(0.3)
Dividends paid to Greif, Inc. shareholders	(27.4)			(27.4)									(27.4)
Dividends paid to noncontrolling interests and other	(7.6)														(7.6)
Dividends earned on RSU shares	(0.2)			(0.2)									(0.2)
Long-term incentive shares issued (in shares)							6			(6)
Long-term incentive shares issued	0.3			0.3			$ 0.3			$ 0.0
Share based compensation	1.3			1.3			$ 1.3
Restricted stock (in shares)									22			(22)
Restricted stock			1.2			1.2			$ 1.2			$ 0.0
Ending balance (in shares) at Apr. 30, 2022							48,636
Ending balance at Apr. 30, 2022	1,718.4			1,686.4			$ 186.0			$ (134.0)			1,910.3	(275.9)	32.0
Ending balance (in shares) at Apr. 30, 2022										28,206
Beginning balance (in shares) at Oct. 31, 2022							47,443
Beginning balance at Oct. 31, 2022	1,794.3			1,761.3			$ 173.5			$ (205.1)			2,095.2	(302.3)	33.0
Beginning balance (in shares) at Oct. 31, 2022										29,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	209.1			201.1									201.1		8.0
Other comprehensive income (loss):
Foreign currency translation	49.0			48.8										48.8	0.2
Derivative financial instruments, net of income tax expense/benefit	(30.8)			(30.8)										(30.8)
Minimum pension liability adjustment, net of income tax expense/benefit	(3.8)			(3.8)										(3.8)
Comprehensive income	223.5			215.3
Current period mark to redemption value of redeemable noncontrolling interest and other	1.0			1.0									1.0
Net income allocated to redeemable noncontrolling interests	(0.2)														(0.2)
Dividends paid to Greif, Inc. shareholders	(57.9)			(57.9)									(57.9)
Dividends paid to noncontrolling interests and other	(5.9)														(5.9)
Dividends earned on RSU shares	0.3			0.3									0.3
Share repurchases (in shares)							(949)			949
Share repurchases	(59.6)			(59.6)			$ 15.0			$ (74.6)
Long-term incentive shares issued (in shares)							349			(349)
Long-term incentive shares issued	16.6			16.6			$ 14.6			$ 2.0
Share based compensation	1.5			1.5			$ 1.5
Restricted stock (in shares)									18			(18)
Restricted stock			1.3						$ 1.2	0.1
Ending balance (in shares) at Apr. 30, 2023							46,861
Ending balance at Apr. 30, 2023	1,914.9			1,879.8			$ 205.8			$ (277.6)			2,239.7	(288.1)	35.1
Ending balance (in shares) at Apr. 30, 2023										29,981
Beginning balance (in shares) at Jan. 31, 2023							47,542
Beginning balance at Jan. 31, 2023	1,882.2			1,845.4			$ 188.5			$ (221.1)			2,157.4	(279.4)	36.8
Beginning balance (in shares) at Jan. 31, 2023										29,300
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	116.0			111.2									111.2		4.8
Other comprehensive income (loss):
Foreign currency translation	(2.3)			(2.2)										(2.2)	(0.1)
Derivative financial instruments, net of income tax expense/benefit	(5.1)			(5.1)										(5.1)
Minimum pension liability adjustment, net of income tax expense/benefit	(1.4)			(1.4)										(1.4)
Comprehensive income	107.2			102.5
Current period mark to redemption value of redeemable noncontrolling interest and other	0.2			0.2									0.2
Net income allocated to redeemable noncontrolling interests	(0.5)														(0.5)
Dividends paid to Greif, Inc. shareholders	(29.0)			(29.0)									(29.0)
Dividends paid to noncontrolling interests and other	(5.9)														(5.9)
Dividends earned on RSU shares	(0.1)			(0.1)									(0.1)
Share repurchases (in shares)							717			717
Share repurchases	(41.8)			(41.8)			$ 15.0			$ (56.8)
Long-term incentive shares issued (in shares)							18			(18)
Long-term incentive shares issued	1.0			1.0			$ 0.8			$ 0.2
Share based compensation	0.3			0.3			$ 0.3
Restricted stock (in shares)									18			(18)
Restricted stock			$ 1.3			$ 1.3			$ 1.2	0.1
Ending balance (in shares) at Apr. 30, 2023							46,861
Ending balance at Apr. 30, 2023	$ 1,914.9			$ 1,879.8			$ 205.8			$ (277.6)			$ 2,239.7	$ (288.1)	$ 35.1
Ending balance (in shares) at Apr. 30, 2023										29,981