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Contingencies - Additional Information (Details) $ in Millions | 12 Months Ended
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May 31, 2021 USD ($)
Loss Contingency [Abstract] |
Litigation, final settlement amount | $ 35
Attorneys fees recognized in connection with underlying lawsuits | 10
Environmental loss contingencies threshold amount | $ 1

X
- Definition Attorneys fees recognized in connection with underlying lawsuits. + References No definition available. + Details
Name: | fdx_AttorneysFeesRecognizedInConnectionWithUnderlyingLawsuits
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Environmental loss contingencies threshold amount. + References No definition available. + Details
Name: | fdx_EnvironmentalContingenciesThresholdAmount
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LossContingencyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration