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Stock Based Compensation (Details 2) | 12 Months Ended
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May 31, 2016
Share Based Compensation Arrangement Stock Options [Abstract] |
Stock option vesting period range | 1 to 4 years
Percentage of options vesting ratably over four years | 82.00%
Restricted stock expiration period | ratably over 4 years
Maximum term of stock options | 10 years

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- Definition The time period after which the equity-based award restrictions expires as specified in the award agreement. + References No definition available. + Details
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- Definition The maximum period of time an equity-based award is expected to be outstanding. + References No definition available. + Details
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- Definition Description of pertinent provisions of share based compensation awards that have actual or potential impact upon the company's financial statements. Vesting term for the majority of stock options. + References No definition available. + Details
Name: | fdx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPeriod
Namespace Prefix: | fdx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | fdx_ShareBasedCompensationArrangementStockOptionsAbstract
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- Definition Period of time over which a employee's right to exercise a stock option is no longer contingent on satisfaction of a service condition. + References No definition available. + Details
Name: | fdx_StockOptionVestingPeriodRange
Namespace Prefix: | fdx_
Data Type: | xbrli:stringItemType
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Period Type: | duration