v3.22.2.2
IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 02, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring reserves classified as long-term   $ 4.6    
Impairment, restructuring and other charges   853.2 $ 29.0 $ 16.8
Noncash impairment charge   $ 35.3    
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment, restructuring and other    
Employee Severance and Impairment Of Property, Plant, And Equipment        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   $ 65.2    
Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Inventory Write-down   120.9    
Operating expenses        
Restructuring Cost and Reserve [Line Items]        
Gains on sale of property, plant and equipment   (16.2) 0.0 0.0
COVID-19 related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     29.2 19.4
U.S. Consumer | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   9.7    
U.S. Consumer | Impairment, Restructuring, And Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   11.9    
U.S. Consumer | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     21.2 12.4
U.S. Consumer | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     4.0 3.8
Hawthorne | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   27.1    
Hawthorne | Impairment, Restructuring, And Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   8.1    
Goodwill and intangible asset impairment   632.4    
Hawthorne | Goodwill Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 522.4 522.4    
Hawthorne | Finite-Lived Intangible Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   110.0    
Hawthorne | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     3.2 2.6
Other | Impairment, Restructuring, And Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   0.7    
Other | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     0.6 0.5
Other | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     $ 0.2 $ 0.1
Corporate Segment | Impairment, Restructuring, And Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   $ 7.7