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Retirement Plans (Details 3) | 12 Months Ended
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May. 31, 2015
Defined Benefit Plan Assets Other Information [Abstract] |
Actual rate of return on plan assets for the 15-year period | 6.70%

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- Definition The actual rate of return on plan assets for the 15-year period reflecting the average rate of earnings on the funds invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
Name: | fdx_DefinedBenefitPlanAssetsActualRateOfReturnForFifteenYearPeriod
Namespace Prefix: | fdx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | fdx_DefinedBenefitPlanAssetsOtherInformationAbstract
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration