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ACQUISITIONS AND INVESTMENTS - Rhizoflora (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 13, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 605.2 | $ 544.1 | $ 538.7
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 |  | $ 350.2 | $ 305.5 | $ 300.0
Hawthorne | Rhizoflora, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred | $ 33.7 |  |  |
Inventory acquired | 0.5 |  |  |
Finite-lived intangible assets acquired | 10.9 |  |  |
Goodwill | $ 22.2 |  |  |
Hawthorne | Rhizoflora, Inc. | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 5 years |  |  |
Hawthorne | Rhizoflora, Inc. | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 25 years |  |  |

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