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Leases - Additional Information (Details)	12 Months Ended
	May 31, 2018	May 31, 2017
Other Lease Information (Details) [Abstract]
Capital and operating leases expiration term	Various dates through 2049
Percentage Total Aircraft Fleet Leased	7.00%	9.00%
Operating leases weighted-average remaining lease term	6 years

X

- Definition

Capital and operating leases expiration term.

+ References

No definition available.

+ Details

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Namespace Prefix:	fdx_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other Lease Information (Details) [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	fdx_
Data Type:	xbrli:stringItemType
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

X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

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