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Leases - Additional Information (Details) $ in Millions	3 Months Ended
	Aug. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Additional leases not yet commenced, undiscounted future payments	$ 872
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease commencement date	2020
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease commencement date	2022

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

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: