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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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