CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (37,459)	$ 150
Other comprehensive income (loss)
Unrealized gain (loss) on available-for-sale marketable securities, net of tax	106	(167)
Total comprehensive loss	$ (37,353)	$ (17)