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ACQUISITIONS AND INVESTMENTS - Luxx Lighting (Details) - USD ($) shares in Millions, $ in Millions	Dec. 30, 2021	Apr. 02, 2022	Sep. 30, 2021	Apr. 03, 2021
Business Acquisition [Line Items]
Goodwill		$ 688.1	$ 605.2	$ 546.1
Hawthorne | Luxx Lighting, Inc.
Business Acquisition [Line Items]
Consideration for the acquisition	$ 213.2
Number of shares issued in acquisition	0.1
Fair value of shares issued in acquisition	$ 21.0
Refund liabilities and warranty claims		$ 8.0
Inventory and accounts receivable acquired	36.4
Current assets	6.3
Liabilities	20.3
Finite-lived intangible assets acquired	106.9
Goodwill	$ 83.9
Hawthorne | Luxx Lighting, Inc. | Minimum
Business Acquisition [Line Items]
Intangible assets amortization period	5 years
Hawthorne | Luxx Lighting, Inc. | Maximum
Business Acquisition [Line Items]
Intangible assets amortization period	25 years

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