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Commitments - Additional Information (Details) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2020 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract] |
Deposit and Progress Payments | $ | $ 632
Lessee Disclosure [Abstract] |
Additional leases not yet commenced, undiscounted future payments | $ | $ 1,100
Minimum [Member] |
Lessee Disclosure [Abstract] |
Operating lease commencement date | 2021
Maximum [Member] |
Lessee Disclosure [Abstract] |
Operating lease commencement date | 2022
B777F [Member] |
Other Aircraft Commitments Disclosure [Abstract] |
Conditional Aircraft Commitments | 6
B767F [Member] |
Other Aircraft Commitments Disclosure [Abstract] |
Number of aircrafts rescheduled delivery, 2021 | 18
Number of aircrafts rescheduled delivery, 2022 | 11
Number of aircrafts rescheduled delivery, 2023 | 13
Number of aircrafts rescheduled delivery, 2024 | 4

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 Lessee, operating and finance lease, lease not yet commenced, undiscounted future payments. + References No definition available. + Details
Name: | fdx_LesseeOperatingAndFinanceLeaseLeaseNotYetCommencedUndiscountedFuturePayments
Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of aircrafts rescheduled delivery in remainder of fiscal year. + References No definition available. + Details
Name: | fdx_NumberOfAircraftsRescheduledDeliveryInRemainderOfFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of aircrafts rescheduled delivery In year one. + References No definition available. + Details
Name: | fdx_NumberOfAircraftsRescheduledDeliveryInYearOne
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of aircrafts rescheduled delivery in year three. + References No definition available. + Details
Name: | fdx_NumberOfAircraftsRescheduledDeliveryInYearThree
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of aircrafts rescheduled delivery in year two. + References No definition available. + Details
Name: | fdx_NumberOfAircraftsRescheduledDeliveryInYearTwo
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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 Operating lease commencement date. + References No definition available. + Details
Name: | fdx_OperatingLeaseCommencementDate
Namespace Prefix: | fdx_
Data Type: | xbrli:gYearItemType
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
- References No definition available. + Details
Name: | us-gaap_LesseeDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
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: |

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