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ACQUISITIONS AND INVESTMENTS - Luxx Lighting (Details) - USD ($) shares in Millions, $ in Millions | Dec. 30, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 243.9 | $ 243.9 | $ 254.0
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 | $ 0.0
Luxx Lighting, Inc. | Hawthorne |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred | $ 213.2 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 0.1 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 21.0 |  |  |
Inventory and accounts receivable acquired | 32.8 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 5.7 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | (24.2) |  |  |
Finite-lived intangible assets acquired | 47.3 |  |  |
Goodwill | $ 151.6 |  |  |
Luxx Lighting, Inc. | Hawthorne | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 5 years |  |  |
Luxx Lighting, Inc. | Hawthorne | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 25 years |  |  |

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