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ACQUISITIONS AND INVESTMENTS - Hydro-Logic (Details) - USD ($) $ in Millions | Aug. 27, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 243.9 | $ 254.0 | $ 605.2
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period |  | 3 years |  |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period |  | 25 years |  |
Hawthorne |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 0.0 | $ 0.0 | $ 350.2
Hawthorne | Hydro-Logic Purification Systems, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred | $ 65.3 |  |  |
Inventory and accounts receivable acquired | 4.5 |  |  |
Other assets acquired | 1.6 |  |  |
Other liabilities assumed | 2.6 |  |  |
Finite-lived intangible assets acquired | 23.1 |  |  |
Goodwill | $ 38.7 |  |  |
Hawthorne | Hydro-Logic Purification Systems, Inc. | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 5 years |  |  |
Hawthorne | Hydro-Logic Purification Systems, Inc. | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 15 years |  |  |

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