Related Party Transactions (Details)	12 Months Ended
May 31, 2017
Related Party Transactions [Abstract]
Related Party Ownership Interest	10.00%

Represents the Chairman, President and Chief Executive Officer's ownership interest in the National Football League Washington Redskins professional football team.

No definition available.

Name:	fdx_RelatedPartyOwnershipInterest
Namespace Prefix:	fdx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration