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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 02, 2022	Jul. 02, 2022	Sep. 30, 2021	Jul. 03, 2021
Goodwill [Line Items]
Goodwill	$ 254.7	$ 254.7	$ 605.2	$ 547.1
Tradenames
Goodwill [Line Items]
Asset impairment charges		69.0
Customer accounts
Goodwill [Line Items]
Asset impairment charges		41.0
Hawthorne
Goodwill [Line Items]
Goodwill	0.0	0.0	$ 350.2
Cost of sales—impairment, restructuring and other | Hawthorne
Goodwill [Line Items]
Restructuring charges and adjustments	10.4	15.6
Goodwill Impairment | Hawthorne
Goodwill [Line Items]
Restructuring charges and adjustments	$ 522.4	$ 522.4

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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