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Retirement Plans (Details 9) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014
Pension Plans Contributions [Abstract] |  |
Required U.S. pension plans contributions | $ 388 | $ 645
Voluntary U.S. pension plans contributions | 272 | 15
Company contributions | $ 660 | $ 660
Required U.S. pension plans contributions in 2016 | 500 |
U.S. pension plans contributions in 2016 | 660 |

X
- Definition The increase in the fair value of plan assets from U.S. contributions made by the employer. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
Name: | fdx_PensionPlansContributionsAbstract
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Data Type: | xbrli:stringItemType
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- Definition The amount of fixed and determinable portion of an unrecorded unconditional purchase obligation related to U.S. domestic pension plans. + References No definition available. + Details
Name: | fdx_PensionsContributionsRemaining
Namespace Prefix: | fdx_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition The amount of required contributions made by the employer. + References No definition available. + Details
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- Definition The amount of required fixed and determinable portion of an unrecorded unconditional purchase obligation related to U.S. domestic pension plans. + References No definition available. + Details
Name: | fdx_RequiredPensionsContributionsRemaining
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- Definition The amount of voluntary contributions made by the employer. + References No definition available. + Details
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Namespace Prefix: | fdx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration