Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Leases [Abstract]
Operating lease cost	$ 6,721	$ 2,290	$ 2,299
Amortization of right-of-use assets	4,489	2,870	3,308
Interest on lease liabilities	$ 2,337	$ 612	$ 625