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SEGMENT INFORMATION - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 3,413.1	$ 3,552.7	$ 3,551.3
Reportable segment total
Segment Reporting Information [Line Items]
Net sales	3,159.5	3,308.4	3,311.0
U.S. Consumer | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,993.7	3,013.7	2,843.7
Hawthorne | Operating Segments
Segment Reporting Information [Line Items]
Net sales	165.8	294.7	467.3
Other non-reportable operating segment
Segment Reporting Information [Line Items]
Net sales	$ 253.6	$ 244.3	$ 240.3

X

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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