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