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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 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	24.5		24.5
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	13.9		13.9
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	1.9	16.5	26.1	20.3
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	0.5	2.0	2.4	2.5
Restructuring and related cost, cost incurred to date	5.0		5.0
COVID-19 related costs | Cost of sales—impairment, restructuring and other | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	0.8	9.6	19.8	12.2
Restructuring and related cost, cost incurred to date	39.5		39.5
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	0.2	0.6	0.3	0.6
Restructuring and related cost, cost incurred to date	1.0		1.0
COVID-19 related costs | Restructuring, settlement and impairment provisions | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	0.3	4.2	3.5	4.9
COVID-19 related costs | Restructuring, settlement and impairment provisions | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 0.1	$ 0.1	$ 0.1	$ 0.1

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