Retirement Plans (Details 4)	12 Months Ended
May 31, 2016
Defined Benefit Plan Assets Other Information [Abstract]
Actual rate of return on plan assets for the 15-year period	6.90%

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.

No definition available.

Name:	fdx_DefinedBenefitPlanAssetsActualRateOfReturnForFifteenYearPeriod
Namespace Prefix:	fdx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration