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COMMITMENTS - Schedule of Aircraft Purchase Commitments (Details)	12 Months Ended
	May 31, 2025 AirCraft
Schedule of Aircraft Commitments [Line Items]
2026	29
2027	12
2028	9
2029	4
2030	2
Thereafter	0
Total	56
Cessna SkyCourier 408
Schedule of Aircraft Commitments [Line Items]
2026	19
2027	4
2028	0
2029	0
2030	0
Thereafter	0
Total	23
ATR 72-600F
Schedule of Aircraft Commitments [Line Items]
2026	3
2027	3
2028	4
2029	4
2030	2
Thereafter	0
Total	16
B767F
Schedule of Aircraft Commitments [Line Items]
2026	7
2027	0
2028	0
2029	0
2030	0
Thereafter	0
Total	7
B777F
Schedule of Aircraft Commitments [Line Items]
2026	0
2027	5
2028	5
2029	0
2030	0
Thereafter	0
Total	10

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 After Fifth Fiscal Year

+ References

No definition available.

+ Details

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

X

- Definition

Aircraft Purchase Obligation With Delivery Due In Fifth Fiscal Year

+ References

No definition available.

+ Details

Name:	fdx_AircraftPurchaseObligationWithDeliveryDueInFifthFiscalYear
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

Aircraft Purchase Obligation With Delivery Due In 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

Aircraft Purchase Obligation With Delivery Due In 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

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_CessnaSkyCourier408Member
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_Boeing767300FreighterMember
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: