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Commitments - Additional Information (Details) $ in Millions	9 Months Ended
	Feb. 28, 2019 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract]
Deposit and Progress Payments | $	$ 965
B767F [Member]
Other Aircraft Commitments Disclosure [Abstract]
Conditional Aircraft Commitments	5
B777F [Member]
Other Aircraft Commitments Disclosure [Abstract]
Conditional Aircraft Commitments	6

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Number of conditional aircraft commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Other aircraft commitments disclosure.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing767FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing777FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: