Leases - Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2022
Leases [Abstract]
Operating lease expenses	$ 709	$ 2,064
Cash paid for amounts included in the measurement of operating lease liabilities	697	2,068
Right-of-use assets obtained in exchange for lease obligation	$ 1,154	$ 1,413