Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year) (Details) - EBP 001 $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	36-3268123
Plan number	001
Participant notes receivable	$ 19.1
Total	$ 835.4
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	4.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Participant loan, interest rate	9.50%
Equity Securities Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	$ 231.9
Fixed Income Mutual Funds
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	34.4
Common Collective Trusts
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	541.1
Investment, Identifier [Axis]: Common Stock \| Greif, Inc. Class A Common Stock \| Common Stock
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	8.5
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| Am Fds Euro Pacific Growth R6Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	18.8
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| DFA Emerg Mkt Core Eqty Portfolio \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	1.8
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| DFA U.S. Targeted Value I Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	6.4
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| Dodge & Cox Stock Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	32.6
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| Fidelity Extended Market Index Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	34.5
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| Fidelity Global ex US Index Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	21.6
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| Vanguard Institutional Index Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	108.0
Investment, Identifier [Axis]: Equity Securities Mutual Funds \| Vanguard Small Cap Growth Index Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	8.2
Investment, Identifier [Axis]: Fixed Income Mutual Funds \| PIMCO Real Return/Institutional Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	28.8
Investment, Identifier [Axis]: Fixed Income Mutual Funds \| PIMCO Total Return Fund \| Mutual Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	5.6
Investment, Identifier [Axis]: Galliard Stable Return E \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	71.6
Investment, Identifier [Axis]: Guaranteed Investment Account \| John Hancock S Guaranteed \| Guaranteed Investment Account
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	0.4
Investment, Identifier [Axis]: Metlife Stable Value Sol J Fd \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	0.3
Investment, Identifier [Axis]: T. Rowe Price Mid-Cap Growth Fund \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	11.3
Investment, Identifier [Axis]: TS&W Collective/MID CAP Value TR \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	4.9
Investment, Identifier [Axis]: Vanguard Target Retirement 2020 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	19.3
Investment, Identifier [Axis]: Vanguard Target Retirement 2025 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	24.8
Investment, Identifier [Axis]: Vanguard Target Retirement 2030 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	81.1
Investment, Identifier [Axis]: Vanguard Target Retirement 2035 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	42.2
Investment, Identifier [Axis]: Vanguard Target Retirement 2040 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	75.5
Investment, Identifier [Axis]: Vanguard Target Retirement 2045 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	35.4
Investment, Identifier [Axis]: Vanguard Target Retirement 2050 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	43.2
Investment, Identifier [Axis]: Vanguard Target Retirement 2055 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	27.4
Investment, Identifier [Axis]: Vanguard Target Retirement 2060 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	19.4
Investment, Identifier [Axis]: Vanguard Target Retirement 2065 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	7.4
Investment, Identifier [Axis]: Vanguard Target Retirement 2070 Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	2.6
Investment, Identifier [Axis]: Vanguard Target Retirement Inc Trust II \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	10.1
Investment, Identifier [Axis]: Winslow Large Cap Growth C Fd \| Common Collective Trust
EBP, Schedule of Asset Held for Investment [Line Items]
Current value	$ 64.6

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

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- Definition

Amount of total assets in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, current value of investment, participant loan, and plan interest in master trust.

+ References

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- Definition

Current value of investment, excluding plan interest in master trust, in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract.

+ References

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- Definition

Amount, after deemed distribution, of participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

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- Definition

Plan number of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), in three-digit numeric format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule II))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (3)
-Publisher DOL-EBSA

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (4)
-Publisher DOL-EBSA

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (2)
-Publisher DOL-EBSA

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (2)
-Publisher DOL-EBSA

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(A)
-Publisher DOL-EBSA

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(C)
-Publisher DOL-EBSA

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(B)
-Publisher DOL-EBSA

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