Leases - Schedule of Assets and Liabilities Related to Operating Leases (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Operating Leases
Right-of-use assets	$ 27,449
Accumulated amortization	(2,074)
Right-of-use assets, net	25,375	$ 2,772
Lease liabilities, current portion	1,771	1,324
Lease liabilities, net of current portion	24,780	$ 2,830
Total operating lease liabilities	$ 26,551