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Commitments - Schedule of Aircraft Purchase Commitments (Details) | 12 Months Ended
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May 31, 2017
Schedule of Aircraft Commitments [Line Items] |
2018 | 18
2019 | 17
2020 | 19
2021 | 13
2022 | 14
Thereafter | 6
Total | 87
Boeing 767 Freighter [Member] |
Schedule of Aircraft Commitments [Line Items] |
2018 | 14
2019 | 15
2020 | 16
2021 | 10
2022 | 10
Thereafter | 6
Total | 71
Boeing 777 Freighter [Member] |
Schedule of Aircraft Commitments [Line Items] |
2018 | 4
2019 | 2
2020 | 3
2021 | 3
2022 | 4
Total | 16

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_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: |