Commitments (Details 4) $ in Millions |
6 Months Ended |
|---|---|
|
Nov. 30, 2016
USD ($)
| |
| Other Aircraft Commitments Disclosure [Abstract] | |
| Boeing 777F Conditional Aircraft Commitments | 7 |
| Boeing 767F Conditional Aircraft Commitments | 4 |
| Other Commitment Disclosures [Line Items] | |
| Deposit and Progress Payments | $ 430 |