Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2018	May 04, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	SCOTTS MIRACLE-GRO CO
Entity Central Index Key	0000825542
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Trading Symbol	SMG
Entity Common Stock, Shares Outstanding		55,365,798