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COMMITMENTS - Additional Information (Details) $ in Millions	Aug. 31, 2025 USD ($)
Other Aircraft Commitments Disclosure [Abstract]
Deposit and progress payments	$ 528
Lessee Disclosure [Abstract]
Additional leases not yet commenced, undiscounted future payments	$ 1,000

X

- Definition

Balance of deposits and progress payments on aircraft purchases and other planned aircraft-related transactions.

+ References

No definition available.

+ Details

Name:	fdx_DepositAndProgressPayments
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Other aircraft commitments disclosure.

+ References

No definition available.

+ Details

Name:	fdx_OtherAircraftCommitmentsDisclosureAbstract
Namespace Prefix:	fdx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LesseeDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration