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Leases - Additional Information (Details) | 12 Months Ended |
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May 31, 2018 | May 31, 2017
Other Lease Information (Details) [Abstract] |  |
Capital and operating leases expiration term | Various dates through 2049 |
Percentage Total Aircraft Fleet Leased | 7.00% | 9.00%
Operating leases weighted-average remaining lease term | 6 years |

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- Definition Capital and operating leases expiration term. + References No definition available. + Details
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- Definition Other Lease Information (Details) [Abstract] + References No definition available. + Details
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- Definition The percentage of total aircraft fleet leased under capital or operating leases as of the period-end date + References No definition available. + Details
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Namespace Prefix: | fdx_
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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