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Commitments (Details 4) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Feb. 28, 2015
Other Aircraft Commitments Disclosure [Abstract]  
Boeing 777F Conditional Aircraft Commitments 9fdx_ConditionalAircraftCommitmentsBoeing777
Boeing 767F Conditional Aircraft Commitments 4fdx_ConditionalAircraftCommitmentsBoeing767
Other Commitment Disclosures [Line Items]  
Deposit and Progress Payments $ 401fdx_DepositAndProgressPayments