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ACQUISITIONS AND INVESTMENTS - True Liberty Bags (Details) - USD ($) $ in Millions	Dec. 23, 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
Hawthorne
Business Acquisition [Line Items]
Goodwill		$ 0.0	$ 0.0	$ 350.2
True Liberty Bags | Hawthorne
Business Acquisition [Line Items]
Total consideration transferred	$ 10.1
Inventory and accounts receivable acquired	1.1
Finite-lived intangible assets acquired	5.8
Goodwill	$ 3.2
True Liberty Bags | Hawthorne | Minimum
Business Acquisition [Line Items]
Intangible assets amortization period	15 years

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