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v3.7.0.1

Leases - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
May 31, 2017 | May 31, 2016
Other Lease Information (Details) [Abstract] |  |
Capital and operating leases expiration term | Various dates through 2049 |
Percentage Total Aircraft Fleet Leased | 9.00% | 10.00%
Operating leases weighted-average remaining lease term | 6 years |

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- Definition Capital and operating leases expiration term. + References No definition available. + Details
Name: | fdx_CapitalAndOperatingLeasesExpirationTerm
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Other Lease Information (Details) [Abstract] + References No definition available. + Details
Name: | fdx_OtherLeaseInformationDetailsAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition The weighted-average remaining lease term for all operating leases outstanding at the period-end date. + References No definition available. + Details
Name: | fdx_WeightedAverageRemainingLeaseTermOperating
Namespace Prefix: | fdx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration