Debt divided by adjusted EBITDA

No definition available.

Name:	fdx_DebtToEarningsBeforeInterestTaxDepreciationAndAmortizationRatio
Namespace Prefix:	fdx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt divided by adjusted EBITDA required by the financial covenant.

+ References

No definition available.

+ Details

Name:	fdx_DebtToEarningsBeforeInterestTaxDepreciationAndAmortizationRatioMaximum
Namespace Prefix:	fdx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Letter of credit maximum sublimit amount.

+ References

No definition available.

+ Details

Name:	fdx_LetterOfCreditMaximumSublimitAmount
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long term debt including current maturities.

+ References

No definition available.

+ Details

Name:	fdx_LongTermDebtIncludingCurrentMaturities
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long term debt including current maturities fair value.

+ References

No definition available.

+ Details

Name:	fdx_LongTermDebtIncludingCurrentMaturitiesFairValue
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

Name:	us-gaap_CommercialPaperNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_SeniorUnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_ZeroPointSevenPercentFixedRateNotesDueInMayTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_ThreePointFourPercentFixedRateNotesDueInJanuaryTwoThousandTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_FloatingRateNotesDueAprilElevenTwoThousandNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_FourPointTwoZeroPercentFixedRateNotesDueInOctoberTwoThousandTwentyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_FourPointNineFivePercentFixedRateNotesDueInOctoberTwoThousandFortyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fdx_EightPointZeroZeroZeroPercentNotesDueJanuaryFifteenTwoThousandNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financing Arrangements - Additional Information (Details) € in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2019 USD ($)	Nov. 30, 2018 USD ($)	Feb. 28, 2019 USD ($)	Feb. 28, 2019 EUR (€)	May 31, 2018 USD ($)
Line Of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Nov. 13, 2020
Letter of Credit Maximum Sublimit Amount	$ 500,000,000		$ 500,000,000
Financial Covenant Terms Ratio	350.00%		350.00%	350.00%
Financial Covenant Compliance Ratio	220.00%		220.00%	220.00%
Commercial paper outstanding	$ 225,000,000		$ 225,000,000
Letters Of Credit Outstanding	53,000,000		53,000,000
Long Term Debt, Including Current Maturities and Exclusive of Capital Leases Carrying Value	18,100,000,000		18,100,000,000		$ 16,500,000,000
Long Term Debt, Including Current Maturities and Exclusive of Capital Leases Fair Value	$ 17,800,000,000		$ 17,800,000,000		$ 16,600,000,000
Long-term debt weighted-average interest rate	3.40%		3.40%	3.40%
Maximum [Member]
Line Of Credit Facility [Line Items]
Commercial paper outstanding	$ 750,000,000		$ 750,000,000
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Term	5 years
Line Of Credit Facility Maximum Borrowing Capacity	$ 2,000,000,000		2,000,000,000
Line of credit facility outstanding for future borrowings	1,722,000,000		1,722,000,000
Senior Unsecured Debt [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 1,200,000,000	$ 1,250,000,000	$ 1,200,000,000
Debt instrument, frequency of interest payment			semi-annually
0.7% Fixed-Rate Notes Due in May 2022 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount \| €				€ 640
Fixed interest rate	0.70%		0.70%	0.70%
Debt instrument, maturity date	May 13, 2022
3.4% Fixed-Rate Notes Due in January 2022 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 500,000,000		$ 500,000,000
Fixed interest rate	3.40%		3.40%	3.40%
Debt instrument, maturity date	Jan. 14, 2022
Floating Rate Notes Due April 11, 2019 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount \| €				€ 500
Debt instrument, maturity date	Apr. 11, 2019
4.20% Fixed-rate Notes Due in October 2028 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount		$ 400,000,000
Fixed interest rate		4.20%
Debt instrument, maturity date		Oct. 17, 2028
4.95% Fixed-rate Notes Due in October 2048 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount		$ 850,000,000
Fixed interest rate		4.95%
Debt instrument, maturity date		Oct. 17, 2048
8.000% Notes Due January 15, 2019 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount		$ 750,000,000
Fixed interest rate		8.00%
Debt instrument, maturity date		Jan. 15, 2019