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Commitments - Additional Information (Details) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2017 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract] |
Boeing 767F Conditional Aircraft Commitments | 4
Boeing 777F Conditional Aircraft Commitments | 6
Deposit and Progress Payments | $ | $ 860

X
- Definition The number of Boeing 767F aircraft committed to be purchased which are conditional on certain events. + References No definition available. + Details
Name: | fdx_ConditionalAircraftCommitmentsBoeing767
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of Boeing 777F aircraft committed to be purchased which are conditional on certain events. + References No definition available. + Details
Name: | fdx_ConditionalAircraftCommitmentsBoeing777
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Balance of deposits and progress payments on aircraft purchases and other planned aircraft-related transactions. + References No definition available. + Details
Name: | fdx_DepositAndProgressPayments
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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