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Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2016 | May 31, 2016
Loss Contingency [Line Items] |  |
LitigationSettlementExpense | $ 11 |
Multidistrict Independent Contractor Litigation [Member] |  |
Loss Contingency [Line Items] |  |
LitigationSettlementAmount |  | $ 204
Independent Contractor California [Member] |  |
Loss Contingency [Line Items] |  |
LitigationSettlementAmount |  | $ 228

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | fdx_LossContingenciesByPlaintiffAxis=fdx_MultidistrictIndependentContractorLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fdx_LossContingenciesByPlaintiffAxis=fdx_IndependentContractorCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |