v3.26.1
IMPAIRMENT, RESTRUCTURING AND OTHER - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Mar. 29, 2025
Jun. 27, 2026
Jun. 28, 2025
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve, long-term $ 2.8     $ 2.8  
Loss on exchange of convertible debt     $ 7.0    
Income Statement Location [Axis]: us-gaap:RestructuringSettlementAndImpairmentProvisions          
Restructuring Cost and Reserve [Line Items]          
Severance costs         $ 13.5
Loss on exchange of convertible debt   $ 0.0   0.0 7.0
Financing Receivable, Credit Loss, Expense (Reversal) 8.7     8.7  
Provision for Other Credit Losses 7.9     7.9  
(Gain) Loss from Litigation Settlement 4.0     4.0  
Income Statement Location [Axis]: smg:CostOfSalesImpairmentRestructuringAndOtherCharges          
Restructuring Cost and Reserve [Line Items]          
Restructuring Costs         3.6
U.S. Consumer reportable segment | Income Statement Location [Axis]: us-gaap:RestructuringSettlementAndImpairmentProvisions          
Restructuring Cost and Reserve [Line Items]          
Severance costs         1.9
U.S. Consumer reportable segment | Income Statement Location [Axis]: smg:CostOfSalesImpairmentRestructuringAndOtherCharges | Employee and Executive Severance          
Restructuring Cost and Reserve [Line Items]          
Severance costs 1.0 $ 2.0   1.7 5.0
Corporate Segment | Income Statement Location [Axis]: us-gaap:RestructuringSettlementAndImpairmentProvisions          
Restructuring Cost and Reserve [Line Items]          
Severance costs $ 21.5     $ 21.7 $ 11.6