IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		33 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, long-term	$ 7.3		$ 7.3		$ 7.3
Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		$ 34.5		$ 185.8
Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			69.7
U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		7.1		8.2	48.1
Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					288.3
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			0.8		2.3
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		0.0	2.4	4.5
Corporate Segment \| Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments					$ 25.1
Cost of sales—impairment, restructuring and other \| U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			3.7
Cost of sales—impairment, restructuring and other \| Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		25.7	62.9	152.6
Impairment, Restructuring, And Other \| U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			(1.2)
Impairment, Restructuring, And Other \| Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments		$ 1.9	1.0	$ 20.1
Restructuring, Settlement And Impairment Provisions
Restructuring Cost and Reserve [Line Items]
Gain (loss) on resolution of dispute	$ 0.0		$ 12.1