Leases - Assets and Liabilities of Lessee (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Leases [Abstract]
Weighted-average remaining lease-term - finance lease	15 years 1 month 6 days	19 years 3 months 18 days
Weighted-average remaining lease-term - operating lease	19 years 9 months 18 days	20 years 3 months 18 days
Weighted-average discount rate - finance lease	4.40%	3.97%
Weighted-average discount rate - operating lease	4.33%	3.98%
Right-of-use assets obtained in exchange for new finance lease liabilities (in thousands)	$ 25,166	$ 52,525
Right-of-use assets obtained in exchange for new operating lease liabilities (in thousands)	$ 14,642	$ 87,723