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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, long-term	$ 1.1
Project Catalyst | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	2.8
Hawthorne | Project Catalyst
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	25.1
Final settlement of escrow funds		$ 2.6
U.S. Consumer | Project Catalyst
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	13.9
Other | Project Catalyst
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	1.3
COVID-19 related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	9.3
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	0.4
Restructuring and related cost, cost incurred to date	3.0
COVID-19 related costs | Cost of sales—impairment, restructuring and other | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	8.3
Restructuring and related cost, cost incurred to date	25.1
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	0.6
COVID-19 related costs | Restructuring, settlement and impairment provisions | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments	$ 0.6

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