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Retirement Plans (Details 3) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2015 | Aug. 31, 2014
Pension Plans Contributions [Abstract] |  |
Required U.S. pension plan contributions | $ 6 | $ 82
Voluntary U.S. pension plan contributions | 159 | 83
U.S. domestic pension contributions | 165 | $ 165
September 2015 U.S. Pension Plans contribution | $ 165 |

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- Definition The employer's contributions paid to the plan in September 2015. Contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
Name: | fdx_DefinedBenefitPlanSeptemberEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition The amount of required contributions made by the employer. + References No definition available. + Details
Name: | fdx_RequiredRetirementPlanContributionsByEmployer
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of voluntary contributions made by the employer. + References No definition available. + Details
Name: | fdx_VoluntaryRetirementPlanContributionsByEmployer
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration