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Commitments - Schedule of Aircraft Purchase Commitments (Details) | 12 Months Ended
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May 31, 2020 air-craft
Schedule of Aircraft Commitments [Line Items] |
2021 | 26
2022 | 39
2023 | 28
2024 | 22
2025 | 20
Thereafter | 6
Total | 141
Cessna SkyCourier 408 [Member] |
Schedule of Aircraft Commitments [Line Items] |
2022 | 9
2023 | 12
2024 | 12
2025 | 12
Thereafter | 5
Total | 50
ATR 72-600F [Member] |
Schedule of Aircraft Commitments [Line Items] |
2021 | 4
2022 | 7
2023 | 6
2024 | 6
2025 | 6
Thereafter | 1
Total | 30
B767F [Member] |
Schedule of Aircraft Commitments [Line Items] |
2021 | 20
2022 | 18
2023 | 8
Total | 46
B777F [Member] |
Schedule of Aircraft Commitments [Line Items] |
2021 | 2
2022 | 5
2023 | 2
2024 | 4
2025 | 2
Total | 15

X
- Definition The total number of aircraft committed to be purchased. + References No definition available. + Details
Name: | fdx_AircraftPurchaseObligation
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of aircraft committed to be purchased with a delivery date after the fifth fiscal year. + References No definition available. + Details
Name: | fdx_AircraftPurchaseObligationWithDeliveryDueAfterFifthFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of aircraft committed to be purchased with a delivery date in the fifth fiscal year. + References No definition available. + Details
Name: | fdx_AircraftPurchaseObligationWithDeliveryDueInFifthFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The number of aircraft committed to be purchased with a delivery date in the fourth fiscal year. + References No definition available. + Details
Name: | fdx_AircraftPurchaseObligationWithDeliveryDueInFourthFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of aircraft committed to be purchased with a delivery date in the second fiscal year. + References No definition available. + Details
Name: | fdx_AircraftPurchaseObligationWithDeliveryDueInSecondFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of aircraft committed to be purchased with a delivery date in the third fiscal year. + References No definition available. + Details
Name: | fdx_AircraftPurchaseObligationWithDeliveryDueInThirdFiscalYear
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Aircraft Commitments [Line Items] + References No definition available. + Details
Name: | fdx_ScheduleOfAircraftCommitmentsLineItems
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_CessnaCE408AircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_ATR72600FreighterMember
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: |

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