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Leases - Additional Information (Details) - USD ($) $ in Billions | 12 Months Ended |
--- | --- | ---
May 31, 2020 | May 31, 2019
Lessee Lease Description [Line Items] |  |
Finance and operating leases expiration term | various dates through 2060 |
Percentage total aircraft fleet leased | 5.00% | 6.00%
Additional leases not yet commenced, undiscounted future payments | $ 1.6 |
Minimum [Member] |  |
Lessee Lease Description [Line Items] |  |
Operating lease commencement date | 2021 |
Maximum [Member] |  |
Lessee Lease Description [Line Items] |  |
Operating lease commencement date | 2022 |

X
- Definition Finance and operating leases expiration term. + References No definition available. + Details
Name: | fdx_FinanceAndOperatingLeasesExpirationTerm
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, operating and finance lease, lease not yet commenced, undiscounted future payments. + References No definition available. + Details
Name: | fdx_LesseeOperatingAndFinanceLeaseLeaseNotYetCommencedUndiscountedFuturePayments
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Operating lease commencement date. + References No definition available. + Details
Name: | fdx_OperatingLeaseCommencementDate
Namespace Prefix: | fdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of total aircraft fleet leased under capital or operating leases as of the period-end date + References No definition available. + Details
Name: | fdx_PercentageOfAircraftFleetLeasedUnderOperatingLeases
Namespace Prefix: | fdx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |