Commitments - Additional Information (Details) $ in Billions	May 31, 2023 USD ($)
Other Aircraft Commitments Disclosure [Abstract]
Deposit and Progress Payments	$ 1.0

Balance of deposits and progress payments on aircraft purchases and other planned aircraft-related transactions.

No definition available.

Name:	fdx_DepositAndProgressPayments
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant