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Commitments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 USD ($) air-craft | Feb. 28, 2018 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract] |  |
Boeing 767F Conditional Aircraft Commitments |  | 4
Boeing 777F Conditional Aircraft Commitments |  | 3
Deposit and Progress Payments | $ | $ 922 | $ 922
B777F Aircraft from 2021 to 2020 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments | 2 |
Aircraft expected to be delivered, earliest fiscal year | 2020 |
Aircraft expected to be delivered, latest fiscal year | 2021 |
B777F Aircraft from 2021 to 2019 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments | 1 |
Aircraft expected to be delivered, earliest fiscal year | 2019 |
Aircraft expected to be delivered, latest fiscal year | 2021 |
B777F Aircraft from 2022 to 2020 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments | 1 |
Aircraft expected to be delivered, earliest fiscal year | 2020 |
Aircraft expected to be delivered, latest fiscal year | 2022 |

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- Details
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