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LEASES - Additional Information (Details) - USD ($) $ in Billions	May 31, 2025	May 31, 2024
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