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ACQUISITIONS AND INVESTMENTS - Rhizoflora (Details) - USD ($) $ in Millions		12 Months Ended
	Aug. 13, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Goodwill		$ 605.2	$ 544.1	$ 538.7
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		$ 350.2	$ 305.5	$ 300.0
Hawthorne | Rhizoflora, Inc.
Business Acquisition [Line Items]
Total consideration transferred	$ 33.7
Inventory acquired	0.5
Finite-lived intangible assets acquired	10.9
Goodwill	$ 22.2
Hawthorne | Rhizoflora, Inc. | Minimum
Business Acquisition [Line Items]
Intangible assets amortization period	5 years
Hawthorne | Rhizoflora, Inc. | Maximum
Business Acquisition [Line Items]
Intangible assets amortization period	25 years

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