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DIVESTITURES - Additional Information (Details) a in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2025 USD ($) | Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Oct. 01, 2025 USD ($) | Sep. 30, 2025 USD ($) | Aug. 05, 2025 a
Business Combination [Line Items] |  |  |  |  |  |  |  |
Gain on sale of properties, plants and equipment, net |  | $ 1.7 | $ (0.1) | $ 217.4 | $ 2.3 |  |  |
Intercompany Sales | Containerboard Business |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cost of products sold |  |  | 6.6 |  | 14.3 |  |  |
Net sales |  |  | $ 6.6 |  | $ 14.3 |  |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Fiber Solutions segment, Soterra LLC |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Number of acres | a |  |  |  |  |  |  |  | 173
Aggregate carrying value |  |  |  |  |  |  | $ 231.4 |
Purchase price |  |  |  |  |  | $ 462.0 |  |
Gain on sale of properties, plants and equipment, net |  |  |  | $ 216.2 |  |  |  |
Discontinued Operations, Disposed of by Sale | Greif Containerboard Solutions, LLC |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Purchase price | $ 1,804.7 |  |  |  |  |  |  |
Incurred transaction costs | $ 23.4 |  |  |  |  |  |  |

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