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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		42 Months Ended
	Mar. 29, 2025	Dec. 28, 2024	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, long-term	$ 4.9			$ 4.9		$ 4.9
Gain (loss) on exchange of convertible debt	0.0	$ 7.0	$ 0.0	7.0	$ 0.0
Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			77.0		73.2
U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Severance costs	3.0			3.0
Restructuring recoveries			0.1		0.9
Restructuring charges and adjustments	2.3		0.5	3.7	1.4	62.0
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						2.9
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			0.0		2.4
Corporate Segment | Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments						25.1
Hawthorne
Restructuring Cost and Reserve [Line Items]
Severance costs	0.6			0.6
Restructuring charges and adjustments	1.4			5.1		$ 302.3
Cost of sales—impairment, restructuring and other
Restructuring Cost and Reserve [Line Items]
Severance costs	3.6			3.6
Cost of sales—impairment, restructuring and other | Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			75.4		67.8
Impairment, Restructuring, And Other
Restructuring Cost and Reserve [Line Items]
Severance costs	5.4			14.9
Impairment, Restructuring, And Other | U.S. Consumer
Restructuring Cost and Reserve [Line Items]
Severance costs	3.3
Impairment, Restructuring, And Other | Corporate Segment
Restructuring Cost and Reserve [Line Items]
Severance costs	2.1			11.6
Impairment, Restructuring, And Other | Hawthorne
Restructuring Cost and Reserve [Line Items]
Restructuring charges and adjustments			$ 1.9		$ 2.3
Restructuring, Settlement And Impairment Provisions
Restructuring Cost and Reserve [Line Items]
Gain (loss) on resolution of dispute	$ 0.0			$ 12.1

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