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v3.19.2

Related Party Transactions (Details) | 12 Months Ended
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May 31, 2019
Frederick W. Smith [Member] | National Football League Washington Redskins [Member] |
Related Party Transaction [Line Items] |
Related party ownership interest | 10.00%

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- 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=fdx_NationalFootballLeagueWashingtonRedskinsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |