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Commitments (Details 4) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Nov. 30, 2014
Other Commitment Disclosures [Abstract]  
Deposit and Progress Payments $ 500fec_DepositAndProgressPayments
Other Aircraft Commitments Disclosure [Line Items]  
Boeing 777F Conditional Aircraft Commitments 9fec_ConditionalAircraftCommitmentsBoeing777
Boeing 767F Conditional Aircraft Commitments 4fec_ConditionalAircraftCommitmentsBoeing767
Aircraft Purchase Commitment Boeing 767 Delivery 2017 And 2019 4fec_Aircraftpurchasecommitmentboeing767delivery2016and2017