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SEGMENT INFORMATION - Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Revenue from External Customer [Line Items]
Net sales	$ 1,186.1	$ 1,609.7	$ 3,430.4	$ 4,187.2
U.S. Consumer
Revenue from External Customer [Line Items]
Net sales	904.5	1,046.2	2,626.7	2,828.4
U.S. Consumer \| Lawn care
Revenue from External Customer [Line Items]
Net sales	219.0	224.6	878.9	920.9
U.S. Consumer \| Growing media and mulch
Revenue from External Customer [Line Items]
Net sales	488.7	573.9	1,110.7	1,196.3
U.S. Consumer \| Controls
Revenue from External Customer [Line Items]
Net sales	102.2	115.1	298.9	319.8
U.S. Consumer \| Roundup® marketing agreement
Revenue from External Customer [Line Items]
Net sales	30.8	46.9	115.5	128.0
U.S. Consumer \| Other
Revenue from External Customer [Line Items]
Net sales	63.8	85.7	222.7	263.4
Hawthorne
Revenue from External Customer [Line Items]
Net sales	154.5	421.9	547.7	1,095.1
Hawthorne \| Lighting
Revenue from External Customer [Line Items]
Net sales	37.5	126.7	128.9	350.5
Hawthorne \| Growing environments
Revenue from External Customer [Line Items]
Net sales	27.9	78.8	116.3	200.1
Hawthorne \| Nutrients
Revenue from External Customer [Line Items]
Net sales	37.6	104.5	118.6	245.7
Hawthorne \| Growing media
Revenue from External Customer [Line Items]
Net sales	25.6	57.9	96.3	151.9
Hawthorne \| Other, primarily hardware
Revenue from External Customer [Line Items]
Net sales	25.9	54.0	87.6	146.9
Other
Revenue from External Customer [Line Items]
Net sales	127.1	141.6	256.0	263.7
Other \| Lawn care
Revenue from External Customer [Line Items]
Net sales	46.6	48.5	85.8	87.7
Other \| Growing media
Revenue from External Customer [Line Items]
Net sales	45.9	57.3	88.8	102.0
Other \| Other, primarily gardening and controls
Revenue from External Customer [Line Items]
Net sales	$ 34.6	$ 35.8	$ 81.4	$ 74.0