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Commitments - Schedule of Aircraft Purchase Commitments (Details)	9 Months Ended
	Feb. 28, 2021 air-craft
Schedule of Aircraft Commitments [Line Items]
2021 (remainder)	9
2022	33
2023	33
2024	26
2025	20
Thereafter	6
Total	127
Cessna SkyCourier 408 [Member]
Schedule of Aircraft Commitments [Line Items]
2022	9
2023	12
2024	12
2025	12
Thereafter	5
Total	50
ATR 72-600F [Member]
Schedule of Aircraft Commitments [Line Items]
2021 (remainder)	2
2022	8
2023	6
2024	6
2025	6
Thereafter	1
Total	29
B767F [Member]
Schedule of Aircraft Commitments [Line Items]
2021 (remainder)	7
2022	11
2023	13
2024	4
Total	35
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2022	5
2023	2
2024	4
2025	2
Total	13

X

- Definition

The total number of aircraft committed to be purchased.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligation
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of aircraft committed to be purchased with a delivery date after the fourth fiscal year.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryDueAfterFourthFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aircraft purchase obligation with delivery due in first fiscal year.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryDueInFirstFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of aircraft committed to be purchased with a delivery date in the fourth fiscal year.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryDueInFourthFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of aircraft committed to be purchased with a delivery date in the second fiscal year.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryDueInSecondFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of aircraft committed to be purchased with a delivery date in the third fiscal year.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryDueInThirdFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aircraft purchase obligation with delivery within remainder of fiscal year.

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryWithinRemainderOfFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Schedule of Aircraft Commitments [Line Items]

+ References

No definition available.

+ Details

Name:	fdx_ScheduleOfAircraftCommitmentsLineItems
Namespace Prefix:	fdx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_CessnaCE408AircraftMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_ATR72600FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing767FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=fdx_Boeing777FreighterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: