Commitments (Details 2)	6 Months Ended
Nov. 30, 2016
Schedule of Aircraft Commitments [Line Items]
2017 (remainder)	2
2018	18
2019	17
2020	19
2021	13
Thereafter	22
Total	91
Boeing 777 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2018	2
2019	2
2020	3
2021	3
Thereafter	6
Total	16
Boeing 767 Freighter [Member]
Schedule of Aircraft Commitments [Line Items]
2017 (remainder)	2
2018	16
2019	15
2020	16
2021	10
Thereafter	16
Total	75

The total number of aircraft committed to be purchased.

No definition available.

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

The number of aircraft committed to be purchased with a delivery date after the fifth fiscal year.

No definition available.

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

The number of aircraft committed to be purchased with a delivery date in the fifth fiscal year.

No definition available.

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

The number of aircraft committed to be purchased with a delivery date in the fourth fiscal year.

No definition available.

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

The number of aircraft committed to be purchased with a delivery date in the second fiscal year.

No definition available.

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

The number of aircraft committed to be purchased with a delivery date in the third fiscal year.

No definition available.

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

The number of aircraft committed to be purchased with a delivery date within the current fiscal year.

No definition available.

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

No definition available.

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

Name:	fdx_AircraftPurchaseObligationAxis=fdx_Boeing777FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	fdx_AircraftPurchaseObligationAxis=fdx_Boeing767FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: