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Commitments - Schedule of Aircraft Purchase Commitments (Details)	9 Months Ended
	Feb. 29, 2024 AirCraft
Schedule of Aircraft Commitments [Line Items]
2024 (remainder)	10
2025	33
2026	17
Total	60
Cessna SkyCourier 408 [Member]
Schedule of Aircraft Commitments [Line Items]
2024 (remainder)	5
2025	13
2026	14
Total	32
ATR 72-600F [Member]
Schedule of Aircraft Commitments [Line Items]
2024 (remainder)	2
2025	8
2026	1
Total	11
B767F [Member]
Schedule of Aircraft Commitments [Line Items]
2024 (remainder)	3
2025	10
2026	2
Total	15
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2025	2
Total	2

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

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 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

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: