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Document and Entity Information - USD ($)
 12 Months Ended
Apr. 30, 2018
Jun. 12, 2018
Oct. 31, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name J M SMUCKER Co    
Entity Central Index Key 0000091419    
Document Type 10-K    
Document Period End Date Apr. 30, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --04-30    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   113,535,111  
Entity Public Float     $ 11,386,975,264