SEGMENT INFORMATION - Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2026	Jun. 28, 2025	Jun. 27, 2026	Jun. 28, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	$ 1,172.1	$ 1,159.3	$ 2,986.1	$ 2,915.7
U.S. Consumer reportable segment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	1,032.9	1,030.2	2,738.4	2,682.6
U.S. Consumer reportable segment \| Growing media and mulch
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	589.5	601.2	1,262.3	1,290.7
U.S. Consumer reportable segment \| Lawn care
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	216.6	227.6	831.6	804.3
U.S. Consumer reportable segment \| Controls
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	136.0	113.1	345.9	305.4
U.S. Consumer reportable segment \| Roundup® marketing agreement
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	43.1	42.1	151.8	132.9
U.S. Consumer reportable segment \| Other, primarily gardening
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	47.7	46.2	146.8	149.3
Other non-reportable operating segment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	139.2	129.1	247.7	233.1
Other non-reportable operating segment \| Lawn care
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	48.6	42.0	84.4	72.7
Other non-reportable operating segment \| Growing media
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	56.3	51.2	92.4	87.0
Other non-reportable operating segment \| Other, primarily gardening and controls
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Net sales	$ 34.3	$ 35.9	$ 70.9	$ 73.4