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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
May 31, 2018
Jul. 12, 2018
Nov. 30, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Period End Date May 31, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Registrant Name FedEx Corporation    
Entity Central Index Key 0001048911    
Current Fiscal Year End Date --05-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 57.3
Entity Common Stock, Shares Outstanding   265,924,840  
Trading Symbol FDX