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Commitments - Additional Information (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 25, 2020 air-craft | May 31, 2020 USD ($) air-craft | May 31, 2020 USD ($) air-craft
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Deposit and Progress Payments | $ |  | $ 633 | $ 633
B767F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Conditional Aircraft Commitments |  |  | 1
Number of additional aircraft agreed to purchase options exercised |  | 6 | 6
Aircraft expected to be delivered, fiscal year |  |  | 2022
B767F [Member] | Subsequent Event [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircrafts rescheduled delivery, 2021 | 18 |  |
Number of aircrafts rescheduled delivery, 2022 | 11 |  |
Number of aircrafts rescheduled delivery, 2023 | 13 |  |
Number of aircrafts rescheduled delivery, 2024 | 4 |  |
B777F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Conditional Aircraft Commitments |  |  | 6
B777F Aircraft from 2023 to 2022 [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircrafts rescheduled delivery |  | 2 | 2
Aircraft expected to be delivered, earliest fiscal year |  |  | 2022
Aircraft expected to be delivered, latest fiscal year |  |  | 2023
B767F Aircraft from 2022 to 2023 [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircrafts rescheduled delivery |  | 2 | 2
Aircraft expected to be delivered, earliest fiscal year |  |  | 2022
Aircraft expected to be delivered, latest fiscal year |  |  | 2023
B767F Aircraft from 2020 to 2021 [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircrafts rescheduled delivery |  | 4 | 4
Aircraft expected to be delivered, earliest fiscal year |  | 2020 |
Aircraft expected to be delivered, latest fiscal year |  | 2021 |
B767F Aircraft from 2021 to 2022 [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Number of aircrafts rescheduled delivery |  | 2 | 2
Aircraft expected to be delivered, earliest fiscal year |  | 2021 |
Aircraft expected to be delivered, latest fiscal year |  | 2022 |
Cessna Sky Courier 408 Aircraft [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Aircraft expected to be delivered, earliest fiscal year |  | 2021 |
Aircraft expected to be delivered, latest fiscal year |  | 2026 |
ATR 72-600F [Member] |  |  |
Other Aircraft Commitments Disclosure [Abstract] |  |  |
Aircraft expected to be delivered, earliest fiscal year |  | 2021 |
Aircraft expected to be delivered, latest fiscal year |  | 2026 |

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