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Cover - USD ($)
 12 Months Ended
Sep. 30, 2023
Nov. 17, 2023
Mar. 31, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2023    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity File Number 001-11593    
Entity Registrant Name Scotts Miracle-Gro Co    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 31-1414921    
Entity Address, Address Line One 14111 Scottslawn Road,    
Entity Address, City or Town Marysville,    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 43041    
City Area Code 937    
Local Phone Number 644-0011    
Title of 12(b) Security Common Shares, $0.01 stated value    
Trading Symbol SMG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,895,917,514
Entity Common Stock, Shares Outstanding   56,552,916  
Documents Incorporated by Reference Portions of the definitive Proxy Statement for the registrant’s 2024 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended September 30, 2023.    
Entity Central Index Key 0000825542    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false