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Retirement Plans (Details 9) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Pension Plans Contributions [Abstract]
Required U.S. pension plans contributions	$ 645fdx_RequiredPensionPlansContributionsByEmployer	$ 560fdx_RequiredPensionPlansContributionsByEmployer
Voluntary U.S. pension plans contributions	15fdx_VoluntaryPensionPlansContributionsByEmployer
Company contributions	660fdx_DefinedBenefitPlanUSContributionsByEmployer	560fdx_DefinedBenefitPlanUSContributionsByEmployer
Required U.S. pension plans contributions in 2015	$ 580fdx_RequiredPensionsContributionsRemaining

X

- Definition

The increase in the fair value of plan assets from U.S. contributions made by the employer.

+ References

No definition available.

+ Details

Name:	fdx_DefinedBenefitPlanUSContributionsByEmployer
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	fdx_PensionPlansContributionsAbstract
Namespace Prefix:	fdx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of required contributions made by the employer.

+ References

No definition available.

+ Details

Name:	fdx_RequiredPensionPlansContributionsByEmployer
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of required fixed and determinable portion of an unrecorded unconditional purchase obligation related to U.S. domestic pension plans.

+ References

No definition available.

+ Details

Name:	fdx_RequiredPensionsContributionsRemaining
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of voluntary contributions made by the employer.

+ References

No definition available.

+ Details

Name:	fdx_VoluntaryPensionPlansContributionsByEmployer
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration