Leases - Additional Information (Details) - USD ($) $ in Billions	12 Months Ended
	May 31, 2023	May 31, 2022
Lessee Lease Description [Line Items]
Finance and operating leases expiration term	various dates through 2060
Percentage total aircraft fleet leased	1.00%	2.00%
Additional leases not yet commenced, undiscounted future payments	$ 1.8
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease commencement date	2024
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease commencement date	2026