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ACQUISITIONS AND INVESTMENTS - Cyco (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 28, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 254.0 | $ 605.2 | $ 544.1
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 | $ 350.2 | $ 305.5
Cyco |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Maximum payout | $ 10.0 |  |  |
Cyco | Hawthorne |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred | 37.3 |  |  |
Contingent consideration | 3.1 |  |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory And Other Current Assets | 1.3 |  |  |
Finite-lived intangible assets acquired | 10.5 |  |  |
Goodwill | $ 25.6 |  |  |
Cyco | Hawthorne | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 5 years |  |  |
Cyco | Hawthorne | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 25 years |  |  |

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