Commitments - Schedule of Aircraft Purchase Commitments (Details)	9 Months Ended
Feb. 28, 2025 AirCraft
Schedule of Aircraft Commitments [Line Items]
2025 (remainder)	10
2026	31
2027	0
2028	6
2029	4
Thereafter	2
Total	53
Cessna SkyCourier 408 [Member]
Schedule of Aircraft Commitments [Line Items]
2025 (remainder)	5
2026	18
2027	0
2028	0
2029	0
Thereafter	0
Total	23
ATR 72-600F [Member]
Schedule of Aircraft Commitments [Line Items]
2025 (remainder)	1
2026	6
2027	0
2028	4
2029	4
Thereafter	2
Total	17
B767F [Member]
Schedule of Aircraft Commitments [Line Items]
2025 (remainder)	2
2026	7
2027	0
2028	0
2029	0
Thereafter	0
Total	9
B777F [Member]
Schedule of Aircraft Commitments [Line Items]
2025 (remainder)	2
2026	0
2027	0
2028	2
2029	0
Thereafter	0
Total	4

The total number of aircraft committed to be purchased.

No definition available.

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

- 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

- Definition

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

+ References

No definition available.

+ Details

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

- 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

- 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

- 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

- Definition

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

+ References

No definition available.

+ Details

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

- 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

- Details

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

- Details

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

- Details

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

- Details

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