Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
Aug. 31, 2013	Aug. 31, 2012
Pension Plans Contributions [Abstract]
Required U.S. pension plan contributions	$ 150	$ 140
September 2013 U.S. Pension Plans contribution	$ 165

The employer's contributions paid to the plan in September 2013. Contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

No definition available.

Name:	fdx_DefinedBenefitPlanSeptemberEmployerContributionsInCurrentFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant