CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	Total	Greif, Inc. Equity	Capital Stock	Treasury Stock	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	93.1	89.9			89.9		3.2
Other comprehensive income (loss):
Foreign currency translation	51.3	51.0				51.0	0.3
Derivative financial instruments, net of income tax expense/benefit	(25.7)	(25.7)				(25.7)
Minimum pension liability adjustment, net of income tax expense/benefit	(2.4)	(2.4)				(2.4)
Comprehensive income	116.3	112.8
Current period mark to redemption value of redeemable noncontrolling interest and other	0.8	0.8			0.8
Net income allocated to redeemable noncontrolling interests	0.3						0.3
Dividends paid to Greif, Inc. shareholders	(28.9)	(28.9)			(28.9)
Dividends earned on RSU shares	0.4	0.4			0.4
Share repurchases (in shares)			(232)	232
Share repurchases	(17.8)	(17.8)	$ 0.0	$ (17.8)
Long-term incentive shares issued (in shares)			331	(331)
Long-term incentive shares issued	15.6	15.6	$ 13.8	$ 1.8
Share based compensation	1.2	1.2	$ 1.2
Ending balance (in shares) at Jan. 31, 2023			47,542
Ending balance at Jan. 31, 2023	1,882.2	1,845.4	$ 188.5	$ (221.1)	2,157.4	(279.4)	36.8
Ending balance (in shares) at Jan. 31, 2023				29,300
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	74.3	67.2			67.2		7.1
Other comprehensive income (loss):
Foreign currency translation	27.6	27.6				27.6	0.0
Derivative financial instruments, net of income tax expense/benefit	(36.2)	(36.2)				(36.2)
Minimum pension liability adjustment, net of income tax expense/benefit	(2.7)	(2.7)				(2.7)
Comprehensive income	63.0	55.9
Current period mark to redemption value of redeemable noncontrolling interest and other	2.3	2.3			2.3
Net income allocated to redeemable noncontrolling interests	(1.6)						(1.6)
Dividends paid to Greif, Inc. shareholders	(29.7)	(29.7)			(29.7)
Colleague stock purchase plan (in shares)			33	(33)
Colleague stock purchase plan	2.0	2.0	$ 1.8	$ 0.2
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	1.4	1.4	$ 1.4
Ending balance (in shares) at Jan. 31, 2024			47,121
Ending balance at Jan. 31, 2024	$ 2,036.4	$ 1,992.5	$ 222.1	$ (279.5)	$ 2,377.7	$ (327.8)	$ 43.9
Ending balance (in shares) at Jan. 31, 2024				29,721