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Commitments - Additional Information (Details) $ in Billions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 24, 2019 air-craft | May 31, 2019 USD ($) air-craft | Jul. 15, 2019 air-craft
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Deposit and Progress Payments | $ |  | $ 1.1 |
B767F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Conditional Aircraft Commitments |  | 5 |
Additional maximum number of aircraft, options to purchase |  | 6 |
B767F [Member] | Subsequent Event [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Conditional Aircraft Commitments | 5 |  |
Aircraft expected to be delivered, earliest fiscal year | 2020 |  |
Aircraft expected to be delivered, latest fiscal year | 2023 |  |
Number of additional aircraft agreed to purchase options exercised | 6 |  |
Aircraft expected to be delivered, fiscal year | 2022 |  |
Number of aircrafts scheduled for delivery | 59 |  |
Number of aircrafts delivered | 1 |  | 1
Number of aircraft total options to purchase | 50 |  |
Aircraft expected to be delivered, through fiscal year | 2026 |  |
B777F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Conditional Aircraft Commitments |  | 6 |
Additional maximum number of aircraft, options to purchase |  | 14 |
Number of aircrafts rescheduled delivery |  | 11 |
B777F [Member] | Subsequent Event [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Conditional Aircraft Commitments | 6 |  |
Aircraft expected to be delivered, earliest fiscal year | 2020 |  |
Aircraft expected to be delivered, latest fiscal year | 2025 |  |
Number of aircrafts scheduled for delivery | 20 |  |
Number of aircrafts delivered | 1 |  |
Number of aircraft total options to purchase | 25 |  |
Aircraft expected to be delivered, through fiscal year | 2028 |  |
Additional B777F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircraft agreed to purchase |  | 12 |
Boeing 777F Conditional Aircraft Commitments |  | 6 |
Aircraft expected to be delivered, earliest fiscal year |  | 2021 |
Aircraft expected to be delivered, latest fiscal year |  | 2025 |
Additional B767F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircraft agreed to purchase |  | 12 |
Boeing 767F Conditional Aircraft Commitments |  | 1 |
Aircraft expected to be delivered, earliest fiscal year |  | 2020 |
Aircraft expected to be delivered, latest fiscal year |  | 2022 |
B777F Aircraft from 2020 to 2019 [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Aircraft expected to be delivered, earliest fiscal year |  | 2019 |
Aircraft expected to be delivered, latest fiscal year |  | 2020 |
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments |  | 1 |
B767F Aircraft from 2020 to 2019 [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Aircraft expected to be delivered, earliest fiscal year |  | 2019 |
Aircraft expected to be delivered, latest fiscal year |  | 2020 |
Accelerate delivery of Boeing 767F conditional aircraft commitments |  | 1 |

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