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Commitments (Details 4) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Nov. 30, 2014
Other Aircraft Commitments Disclosure [Abstract]  
Boeing 777F Conditional Aircraft Commitments 9fdx_ConditionalAircraftCommitmentsBoeing777
Boeing 767F Conditional Aircraft Commitments 4fdx_ConditionalAircraftCommitmentsBoeing767
Aircraft Purchase Commitment Boeing 767F Delivery 2017 and 2019 4fdx_aircraftpurchasecommitmentboeing767Fdelivery2016and20017
Other Commitment Disclosures [Line Items]  
Deposit and Progress Payments $ 500fdx_DepositAndProgressPayments