Leases - Assets and Liabilities of Lessee (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Leases [Abstract]
Weighted-average remaining lease-term - finance lease	19 years 3 months 18 days	10 years 10 months 24 days
Weighted-average remaining lease-term - operating lease	20 years 3 months 18 days	20 years 4 months 24 days
Weighted-average discount rate - finance lease	3.97%	5.38%
Weighted-average discount rate - operating lease	3.98%	4.42%
Right-of-use assets obtained in exchange for new finance lease liabilities (in thousands)	$ 52,525	$ 0
Right-of-use assets obtained in exchange for new operating lease liabilities (in thousands)	$ 87,723	$ 1,109