CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	Total	Directors	Greif, Inc. Equity	Greif, Inc. Equity Directors	Common Stock	Common Stock Directors	Treasury Stock	Treasury Stock Directors	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non controlling interests
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 benefit (expense)	(30.8)		(30.8)							(30.8)
Minimum pension liability adjustment, net of income tax benefit (expense)	(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		$ 1.3		$ 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 benefit (expense)	(5.1)		(5.1)							(5.1)
Minimum pension liability adjustment, net of income tax benefit (expense)	(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
Beginning balance (in shares) at Oct. 31, 2023					46,805
Beginning balance at Oct. 31, 2023	1,986.3		1,947.9		$ 208.4		$ (281.9)		2,337.9	(316.5)	38.4
Beginning balance (in shares) at Oct. 31, 2023							30,037
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126.3		111.6						111.6		14.7
Other comprehensive income (loss):
Foreign currency translation	(1.6)		(0.7)							(0.7)	(0.9)
Derivative financial instruments, net of income tax benefit (expense)	(8.5)		(8.5)							(8.5)
Minimum pension liability adjustment, net of income tax benefit (expense)	(2.4)		(2.4)							(2.4)
Comprehensive income	113.8		100.0
Current period mark to redemption value of redeemable noncontrolling interest and other	1.8		1.8						1.8
Net income allocated to redeemable noncontrolling interests	(3.8)										(3.8)
Dividends paid to Greif, Inc. shareholders	(59.7)		(59.7)						(59.7)
Dividends paid to noncontrolling interests and other	(10.1)										(10.1)
Dividends earned on RSU shares	(0.1)		(0.1)						(0.1)
Colleague stock purchase plan (in shares)					33		(33)
Colleague stock purchase plan	2.3		2.3		$ 2.0		$ 0.3
Long-term incentive shares issued (in shares)					283		(283)
Long-term incentive shares issued	12.7		12.7		$ 10.5		$ 2.2
Share based compensation	3.1		3.1		$ 3.1
Restricted stock (in shares)						18		(18)
Restricted stock		1.1				$ 1.0	0.1
Ending balance (in shares) at Apr. 30, 2024					47,139
Ending balance at Apr. 30, 2024	2,047.4		2,009.1		$ 225.0		$ (279.3)		2,391.5	(328.1)	38.3
Ending balance (in shares) at Apr. 30, 2024							29,703
Beginning balance (in shares) at Jan. 31, 2024					47,121
Beginning balance at Jan. 31, 2024	2,036.4		1,992.5		$ 222.1		$ (279.5)		2,377.7	(327.8)	43.9
Beginning balance (in shares) at Jan. 31, 2024							29,721
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52.0		44.4						44.4		7.6
Other comprehensive income (loss):
Foreign currency translation	(29.2)		(28.3)							(28.3)	(0.9)
Derivative financial instruments, net of income tax benefit (expense)	27.7		27.7							27.7
Minimum pension liability adjustment, net of income tax benefit (expense)	0.3		0.3							0.3
Comprehensive income	50.8		44.1
Current period mark to redemption value of redeemable noncontrolling interest and other	(0.5)		(0.5)						(0.5)
Net income allocated to redeemable noncontrolling interests	(2.2)										(2.2)
Dividends paid to Greif, Inc. shareholders	(30.0)		(30.0)						(30.0)
Dividends paid to noncontrolling interests and other	(10.1)										(10.1)
Dividends earned on RSU shares	(0.1)		(0.1)						(0.1)
Colleague stock purchase plan	0.3		0.3		0.2		$ 0.1
Share based compensation	1.7		1.7		$ 1.7
Restricted stock (in shares)						18		(18)
Restricted stock		$ 1.1		$ 1.1		$ 1.0	0.1
Ending balance (in shares) at Apr. 30, 2024					47,139
Ending balance at Apr. 30, 2024	$ 2,047.4		$ 2,009.1		$ 225.0		$ (279.3)		$ 2,391.5	$ (328.1)	$ 38.3
Ending balance (in shares) at Apr. 30, 2024							29,703