Commitments (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
May 31, 2014
Other Commitment Disclosures [Abstract]
Deposit and Progress Payments	$ 396fdx_DepositAndProgressPayments
Required U.S. pension plans contributions in 2015	$ 580
Other Aircraft Disclosures [Line Items]
Boeing 777F Conditional Aircraft Commitments	9
Boeing 767F Conditional Aircraft Commitments	4
Boeing 757F Aircraft Options Purchased delivered through 2015	16fdx_AdditionalAircraftOptionsPurchased
Aircraft purchase commitment Boeing 767F delivery 2016 and 2017	2
Boeing 777 options deferred two years	11fdx_Boeing777optionsdeferredtwoyears

The number of additional Boeing 757F aircraft options purchased in the current period.

No definition available.

Name:	fdx_AdditionalAircraftOptionsPurchased
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Aircraft purchase commitment Boeing 767F delivery 2016 and 2017

No definition available.

Name:	fdx_Aircraftpurchasecommitmentboeing767fdelivery2016and2017
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Boeing 777 options deferred two years

No definition available.

Name:	fdx_Boeing777optionsdeferredtwoyears
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of Boeing 767F aircraft committed to be purchased which are conditional on certain events.

No definition available.

Name:	fdx_ConditionalAircraftCommitmentsBoeing767
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The number of Boeing 777F aircraft committed to be purchased which are conditional on certain events.

No definition available.

Name:	fdx_ConditionalAircraftCommitmentsBoeing777
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Balance of deposits and progress payments on aircraft purchases and other planned aircraft-related transactions.

No definition available.

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

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

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

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

No definition available.

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