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Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Feb. 28, 2015 | Feb. 28, 2014
Pension Plans Contributions [Abstract] |  |
Required U.S. pension plan contributions | $ 380 fdx_RequiredRetirementPlanContributionsByEmployer | $ 480 fdx_RequiredRetirementPlanContributionsByEmployer
Voluntary U.S. pension plan contributions | 115 fdx_VoluntaryRetirementPlanContributionsByEmployer | 15 fdx_VoluntaryRetirementPlanContributionsByEmployer
U.S. domestic pension contributions | 495 us-gaap_DefinedBenefitPlanContributionsByEmployer | 495 us-gaap_DefinedBenefitPlanContributionsByEmployer
March 2015 U.S. Pension Plans voluntary contribution | $ 160 fdx_DefinedBenefitPlanMarchEmployerContributionsInCurrentFiscalYear |

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- Definition The employer's voluntary contributions paid to the plan in March 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_DefinedBenefitPlanMarchEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration