Leases -Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Cash paid for amounts included in the measurement of operating lease liabilities:
Cash payments included in the measurement of operating lease liabilities – operating cash flows	$ 4,667	$ 4,031
Right-of-use assets obtained in exchange for lease obligations	26,529	0	$ 0
Right-of-use assets obtained in exchange for lease obligations arising from lease modifications	$ 1,572	$ 0	$ 0