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Commitments - Additional Information (Details) $ in Billions |  | 12 Months Ended
--- | --- | ---
Jun. 18, 2018 air-craft | May 31, 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 | $ |  | $ 1.2
Cessna SkyCourier 408 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Number of aircraft agreed to purchase |  | 50
Additional maximum number of aircraft, options to purchase |  | 50
Aircraft expected to be delivered, earliest fiscal year |  | 2021
Aircraft expected to be delivered, latest fiscal year |  | 2024
ATR 72-600F [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Number of aircraft agreed to purchase |  | 30
Additional maximum number of aircraft, options to purchase |  | 20
Aircraft expected to be delivered, earliest fiscal year |  | 2021
Aircraft expected to be delivered, latest fiscal year |  | 2026
B777F Aircraft from 2021 to 2020 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Aircraft expected to be delivered, earliest fiscal year |  | 2020
Aircraft expected to be delivered, latest fiscal year |  | 2021
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments |  | 2
B777F Aircraft from 2021 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 |  | 2021
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments |  | 1
B777F Aircraft from 2022 to 2020 [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Aircraft expected to be delivered, earliest fiscal year |  | 2020
Aircraft expected to be delivered, latest fiscal year |  | 2022
Accelerate Delivery of Boeing 777F Conditional Aircraft Commitments |  | 1
Additional B777F [Member] | Subsequent Event [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Boeing 777F Conditional Aircraft Commitments | 6 |
Number of aircraft agreed to purchase | 12 |
Aircraft expected to be delivered, earliest fiscal year | 2021 |
Aircraft expected to be delivered, latest fiscal year | 2025 |
Additional B767F [Member] | Subsequent Event [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Boeing 767F Conditional Aircraft Commitments | 1 |
Number of aircraft agreed to purchase | 12 |
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] | Subsequent Event [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] | Subsequent Event [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 |
B777F [Member] | Subsequent Event [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Additional maximum number of aircraft, options to purchase | 14 |
Aircraft expected to be delivered, earliest fiscal year | 2019 |
Aircraft expected to be delivered, latest fiscal year | 2025 |
Number of aircrafts scheduled for delivery | 24 |
Number of aircrafts delivered | 1 |
Number of conditional aircraft commitments | 6 |
Number of non conditional aircrafts | 3 |
Number of aircrafts rescheduled delivery | 11 |
Number of aircraft total options to purchase | 25 |
Aircraft expected to be delivered, through fiscal year | 2028 |
B767F [Member] | Subsequent Event [Member] |  |
Other Aircraft Commitments Disclosure [Abstract] |  |
Additional maximum number of aircraft, options to purchase | 6 |
Aircraft expected to be delivered, earliest fiscal year | 2019 |
Aircraft expected to be delivered, latest fiscal year | 2023 |
Number of aircrafts scheduled for delivery | 69 |
Number of aircrafts delivered | 2 |
Number of conditional aircraft commitments | 5 |
Number of aircraft total options to purchase | 50 |
Aircraft expected to be delivered, through fiscal year | 2026 |

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