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ACQUISITIONS AND DIVESTITURES - Additional Information (Details) $ in Millions |  |  | 3 Months Ended | 11 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2025 USD ($) | Mar. 26, 2024 USD ($) | Jul. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) | Oct. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Oct. 01, 2025 USD ($) | Aug. 05, 2025 derivative
Business Combination [Line Items] |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  |  | $ 1,780.4 | $ 89.0 | $ 105.3 |  |
Gain on disposal of business |  |  |  | 1,094.9 | 46.0 | 64.0 |  |
Goodwill |  |  |  | 1,696.5 | 1,655.5 | $ 1,394.8 |  |
Ipackchem Acquisition |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Purchase price |  | $ 582.1 |  |  |  |  |  |
Acquisition and integration related costs |  | 8.9 |  |  |  |  |  |
Goodwill |  | $ 281.0 |  |  |  |  |  |
Ipackchem Acquisition | Minimum | Building and Building Improvements |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Newly constructed road, depreciation period |  | 1 year |  |  |  |  |  |
Ipackchem Acquisition | Minimum | Equipment |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Newly constructed road, depreciation period |  | 1 year |  |  |  |  |  |
Ipackchem Acquisition | Maximum | Building and Building Improvements |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Newly constructed road, depreciation period |  | 21 years |  |  |  |  |  |
Ipackchem Acquisition | Maximum | Equipment |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Newly constructed road, depreciation period |  | 10 years |  |  |  |  |  |
Intercompany Sales, Recycled Fiber | Containerboard Business |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cost of products sold |  |  |  | 23.3 | 34.6 |  |  |
Net sales |  |  |  | 23.3 | $ 34.6 |  |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Soterra LLC |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Number of acres | derivative |  |  |  |  |  |  |  | 173,000
Aggregate carrying value |  |  |  | $ 231.4 |  |  |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Soterra LLC | Subsequent Event |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 462.0 |
Discontinued Operations, Disposed of by Sale | Greif Containerboard Solutions, LLC |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash consideration | $ 1,804.7 |  |  |  |  |  |  |
Transaction costs | $ 23.4 |  |  |  |  |  |  |
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 |  |  |  |  |

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