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ACQUISITIONS AND INVESTMENTS - Hydro-Logic (Details) - USD ($) $ in Millions | Aug. 27, 2021 | Apr. 02, 2022 | Sep. 30, 2021 | Apr. 03, 2021
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 688.1 | $ 605.2 | $ 546.1
Hawthorne | Hydro-Logic Purification Systems, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Consideration for the acquisition | $ 65.3 |  |  |
Inventory and accounts receivable acquired | 4.9 |  |  |
Noncurrent assets acquired | 1.6 |  |  |
Other liabilities assumed | 2.4 |  |  |
Finite-lived intangible assets acquired | 23.1 |  |  |
Goodwill | $ 38.1 |  |  |
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 | 25 years |  |  |

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