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ACQUISITIONS AND DIVESTITURES - Additional Information (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 26, 2024 USD ($) | Jul. 31, 2025 USD ($) | Jul. 31, 2024 USD ($) | Jul. 31, 2025 USD ($) | Jul. 31, 2024 USD ($) | Aug. 05, 2025 USD ($) derivative | Jun. 30, 2025 USD ($) | Oct. 31, 2024 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |  |
Gain on disposal of business |  |  |  | $ (2.6) |  |  |  |
Goodwill |  | $ 1,695.8 |  | 1,695.8 |  |  |  | $ 1,655.5
Ipackchem Acquisition |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash consideration | $ 582.1 |  |  |  |  |  |  |
Acquisition and integration related costs | 8.9 |  |  |  |  |  |  |
Goodwill | $ 281.0 |  |  |  |  |  |  |
Ipackchem Acquisition | Minimum | Building and Building Improvements |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Useful life | 1 year |  |  |  |  |  |  |
Ipackchem Acquisition | Minimum | Equipment |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Useful life | 1 year |  |  |  |  |  |  |
Ipackchem Acquisition | Maximum | Building and Building Improvements |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Useful life | 21 years |  |  |  |  |  |  |
Ipackchem Acquisition | Maximum | Equipment |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Useful life | 10 years |  |  |  |  |  |  |
Intercompany Sales | Containerboard Business |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cost of products sold |  | 7.2 | $ 9.8 | 21.0 | $ 26.3 |  |  |
Net sales |  | $ 7.2 | 9.8 | $ 21.0 | 26.3 |  |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Fiber Solutions segment, Soterra LLC | Subsequent Event |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Number of acres | derivative |  |  |  |  |  | 173,000 |  |
Purchase price |  |  |  |  |  | $ 462.0 |  |
Discontinued Operations, Disposed of by Sale | Greif Containerboard Solutions, LLC |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 1,800.0 |
Discontinued Operations, Disposed of by Sale | Delta Petroleum Company, Inc. |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | 91.2 |  |  |  |  |
Gain on disposal of business |  |  | 46.1 |  |  |  |  |
Disposal group, including discontinued operation, goodwill |  |  | $ 26.1 |  | $ 26.1 |  |  |

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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