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INVESTMENT IN UNCONSOLIDATED AFFILIATES (Details) shares in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 07, 2023 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jul. 18, 2025 shares | Dec. 18, 2024 USD ($) shares | Dec. 31, 2022 | Dec. 31, 2020
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Payments to acquire equity interest |  | $ 0.0 | $ 21.4 | $ 0.0 |  |  |  |
Equity in loss of unconsolidated affiliates |  | 2.8 | 68.1 | 101.1 |  |  |  |
Bonnie Plants, LLC |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Percent ownership | 50.00% |  |  |  |  |  | 45.00% | 50.00%
Payments to acquire equity interest | $ 21.4 |  |  |  |  |  |  |
Ownership percentage increase (decrease) | 5.00% |  |  |  |  |  |  |
Equity in loss of unconsolidated affiliates |  | (5.4) |  |  |  |  |  |
Pre-tax impairment charges |  |  | $ 61.9 | $ 94.7 |  |  |  |
Fluent |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity in loss of unconsolidated affiliates |  | $ 8.2 |  |  |  |  |  |
Non-voting exchangeable shares acquired (in shares) | shares |  |  |  |  |  | 153.1 |  |
Non-voting exchangeable shares converted (in shares) | shares |  |  |  |  | 153.1 |  |  |
Percentage of outstanding shares owned |  | 0.25 |  |  |  |  |  |
Loss on exchange of convertible debt investment |  | $ (7.0) |  |  |  |  |  |
Initial fair value |  |  |  |  |  | $ 10.7 |  |
RIV Capital, Inc. |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Convertible debt |  |  |  |  |  | $ 17.7 |  |

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