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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 02, 2022
Apr. 03, 2021
Apr. 02, 2022
Apr. 03, 2021
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve, long-term $ 0.4   $ 0.4  
Cost of sales—impairment, restructuring and other | Hawthorne        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments 5.3   5.3  
Restructuring, settlement and impairment provisions | Hawthorne        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments $ 0.1   $ 0.1  
COVID-19 related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments   $ 14.9   $ 24.2
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Hawthorne        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments   1.5   1.9
COVID-19 related costs | Cost of sales—impairment, restructuring and other | U.S. Consumer        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments   10.7   19.0
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments   0.1   0.1
COVID-19 related costs | Restructuring, settlement and impairment provisions | U.S. Consumer        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges and adjustments   $ 2.6   $ 3.2