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SEGMENT INFORMATION - Net Sales by Product Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenue from External Customer [Line Items]      
Net sales $ 4,925.0 $ 4,131.6 $ 3,156.0
U.S. Consumer | Growing media and mulch      
Revenue from External Customer [Line Items]      
Net sales 1,286.7 1,164.0 942.5
U.S. Consumer | Lawn care      
Revenue from External Customer [Line Items]      
Net sales 1,060.6 943.3 781.6
U.S. Consumer | Controls      
Revenue from External Customer [Line Items]      
Net sales 402.4 383.7 310.8
U.S. Consumer | Roundup marketing agreement      
Revenue from External Customer [Line Items]      
Net sales 145.2 132.7 112.1
U.S. Consumer | Other, primarily gardening      
Revenue from External Customer [Line Items]      
Net sales 302.8 259.8 164.7
Hawthorne      
Revenue from External Customer [Line Items]      
Net sales 1,424.2 1,023.1 640.6
Hawthorne | Lighting      
Revenue from External Customer [Line Items]      
Net sales 452.4 328.7 214.8
Hawthorne | Nutrients      
Revenue from External Customer [Line Items]      
Net sales 307.8 232.6 154.5
Hawthorne | Growing environment      
Revenue from External Customer [Line Items]      
Net sales 264.0 154.2 82.7
Hawthorne | Growing media      
Revenue from External Customer [Line Items]      
Net sales 192.6 148.9 91.1
Hawthorne | Other, primarily hardware      
Revenue from External Customer [Line Items]      
Net sales 207.4 158.7 97.5
Other      
Revenue from External Customer [Line Items]      
Net sales 303.1 225.0 203.7
Other | Lawn care      
Revenue from External Customer [Line Items]      
Net sales 99.2 73.7 69.2
Other | Growing media      
Revenue from External Customer [Line Items]      
Net sales 116.7 90.6 77.8
Other | Other, primarily gardening and controls      
Revenue from External Customer [Line Items]      
Net sales $ 87.2 $ 60.7 $ 56.7