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