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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 03, 2021	Mar. 28, 2020	Apr. 03, 2021	Mar. 28, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, long-term	$ 1.1		$ 1.1
Project Catalyst | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	2.8		2.8
Hawthorne | Project Catalyst
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	25.1		25.1
Final settlement of escrow funds		$ 0.0		$ 2.6
U.S. Consumer | Project Catalyst
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	14.0		14.0
Other | Project Catalyst
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	1.3		1.3
COVID-19 related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	14.9	3.8	24.2	3.8
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	1.5	0.5	1.9	0.5
Restructuring and related cost, cost incurred to date	4.5		4.5
COVID-19 related costs | Cost of sales—impairment, restructuring and other | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	10.7	2.6	19.0	2.6
Restructuring and related cost, cost incurred to date	38.4		38.4
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	0.1		0.1
Restructuring and related cost, cost incurred to date	0.7		0.7
COVID-19 related costs | Restructuring, settlement and impairment provisions | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 2.6	$ 0.7	$ 3.2	$ 0.7

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