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Commitments - Additional Information (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Feb. 28, 2025 USD ($) | Mar. 31, 2025 Option
Other Aircraft Commitments Disclosure [Abstract] |  |
Deposit and progress payments | $ | $ 594 |
Lessee Disclosure [Abstract] |  |
Additional leases not yet commenced, undiscounted future payments | $ | $ 900 |
Minimum [Member] |  |
Lessee Disclosure [Abstract] |  |
Operating lease commencement date | 2025 |
Maximum [Member] |  |
Lessee Disclosure [Abstract] |  |
Operating lease commencement date | 2027 |
B777F [Member] |  |
Lessee Disclosure [Abstract] |  |
Number of express exercised options will be delivered in 2026 |  | 3
Number of express exercised options to purchase |  | 8
Number of express exercised options will be delivered in 2027 |  | 5

X
- Definition Aircraft purchase option exercised with delivery due in first fiscal year. + References No definition available. + Details
Name: | fdx_AircraftPurchaseOptionExercisedWithDeliveryDueInFirstFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of aircraft purchase options exercised with a delivery date in the second fiscal year. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The number of aircraft purchase options exercised. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Operating lease commencement date. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other aircraft commitments disclosure. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
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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: |