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Related Party Transactions (Details)	12 Months Ended
	May 31, 2018
Related Party Transactions [Abstract]
Related Party Ownership Interest	10.00%

X

- Definition

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

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration