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LEASES - Additional Information (Details) - USD ($) $ in Billions | May 31, 2025 | May 31, 2024
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Leases [Abstract] |  |
Percentage of total aircraft fleet leased | 1.00% | 1.00%
Additional leases not yet commenced, undiscounted future payments | $ 1.1 |

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 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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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