CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (56,739)	$ (14,944)	$ (94,198)	$ (14,794)
Other comprehensive loss
Unrealized loss on available-for-sale marketable securities, net of tax	(427)	(195)	(321)	(362)
Total comprehensive loss	$ (57,166)	$ (15,139)	$ (94,519)	$ (15,156)