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IMPAIRMENT, RESTRUCTURING AND OTHER - Employee and Executive Severance (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 28, 2025
Dec. 28, 2024
Jun. 28, 2025
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve, long-term $ 4.1   $ 4.1
Loss on exchange of convertible debt   $ 7.0  
U.S. Consumer      
Restructuring Cost and Reserve [Line Items]      
Severance costs 2.0   5.0
Hawthorne      
Restructuring Cost and Reserve [Line Items]      
Severance costs 0.6   1.2
Cost of sales—impairment, restructuring and other      
Restructuring Cost and Reserve [Line Items]      
Severance costs 2.6   6.2
Operating Expenses - Impairment, Restructuring, And Other      
Restructuring Cost and Reserve [Line Items]      
Severance costs 1.4   16.2
Loss on exchange of convertible debt $ 0.0   7.0
Operating Expenses - Impairment, Restructuring, And Other | U.S. Consumer      
Restructuring Cost and Reserve [Line Items]      
Severance costs     1.9
Operating Expenses - Impairment, Restructuring, And Other | Hawthorne      
Restructuring Cost and Reserve [Line Items]      
Severance costs     2.7
Operating Expenses - Impairment, Restructuring, And Other | Corporate Segment      
Restructuring Cost and Reserve [Line Items]      
Severance costs     $ 11.6