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SEGMENT INFORMATION - Net Sales by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 03, 2021	Mar. 28, 2020	Apr. 03, 2021	Mar. 28, 2020
Revenue from External Customer [Line Items]
Net sales	$ 1,828.8	$ 1,382.8	$ 2,577.4	$ 1,748.6
U.S. Consumer
Revenue from External Customer [Line Items]
Net sales	1,374.0	1,113.2	1,782.2	1,278.6
U.S. Consumer | Growing media and mulch
Revenue from External Customer [Line Items]
Net sales	532.4	416.8	622.4	461.6
U.S. Consumer | Lawn care
Revenue from External Customer [Line Items]
Net sales	530.3	451.2	696.3	502.0
U.S. Consumer | Controls
Revenue from External Customer [Line Items]
Net sales	142.2	115.0	204.7	143.8
U.S. Consumer | Roundup® marketing agreement
Revenue from External Customer [Line Items]
Net sales	63.8	54.1	81.1	63.0
U.S. Consumer | Other, primarily gardening
Revenue from External Customer [Line Items]
Net sales	105.3	76.1	177.7	108.2
Hawthorne
Revenue from External Customer [Line Items]
Net sales	363.8	219.5	673.2	400.3
Hawthorne | Lighting
Revenue from External Customer [Line Items]
Net sales	108.5	59.9	223.8	120.7
Hawthorne | Nutrients
Revenue from External Customer [Line Items]
Net sales	76.0	54.3	132.9	91.9
Hawthorne | Growing media
Revenue from External Customer [Line Items]
Net sales	58.4	39.8	94.0	65.3
Hawthorne | Other, primarily hardware and growing environments
Revenue from External Customer [Line Items]
Net sales	120.9	65.5	222.5	122.4
Other
Revenue from External Customer [Line Items]
Net sales	91.0	50.1	122.0	69.7
Other | Lawn care
Revenue from External Customer [Line Items]
Net sales	34.4	20.9	39.2	24.3
Other | Growing media
Revenue from External Customer [Line Items]
Net sales	27.9	13.5	44.7	24.7
Other | Other, primarily gardening and controls
Revenue from External Customer [Line Items]
Net sales	$ 28.7	$ 15.7	$ 38.1	$ 20.7

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