Document and Entity Information - shares	6 Months Ended
	Oct. 31, 2018	Nov. 20, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	J M SMUCKER Co
Entity Central Index Key	0000091419
Document Type	10-Q
Document Period End Date	Oct. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--04-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		113,758,133