CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance, shares (in shares) at Apr. 30, 2021		102,167
Beginning Balance, Amount at Apr. 30, 2021	$ 1,061,175	$ 102	$ 1,410,325	$ 81	$ (349,333)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of stock options, net of repurchases (in shares)		1,693
Issuance of Class A common stock upon exercise of stock options, net of repurchases	5,002	$ 2	5,000
Vesting of early exercised Class A common stock options	1,059		1,059
Vesting of restricted stock units (in shares)		8
Stock-based compensation expense	13,912		13,912
Other comprehensive income (loss)	106			106
Net loss	(37,459)				(37,459)
Ending Balance, shares (in shares) at Jul. 31, 2021		103,868
Ending Balance, Amount at Jul. 31, 2021	1,043,795	$ 104	1,430,296	187	(386,792)
Beginning Balance, shares (in shares) at Apr. 30, 2022		106,225
Beginning Balance, Amount at Apr. 30, 2022	$ 989,477	$ 106	1,532,917	(2,148)	(541,398)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of stock options, net of repurchases (in shares)	287	278
Issuance of Class A common stock upon exercise of stock options, net of repurchases	$ 1,101	$ 0	1,101
Vesting of early exercised Class A common stock options	333		333
Vesting of restricted stock units (in shares)		1,841
Vesting of restricted stock units	13,671	$ 2	13,669
Stock-based compensation expense	46,467		46,467
Other comprehensive income (loss)	(200)			(200)
Net loss	(71,871)				(71,871)
Ending Balance, shares (in shares) at Jul. 31, 2022		108,344
Ending Balance, Amount at Jul. 31, 2022	$ 978,978	$ 108	$ 1,594,487	$ (2,348)	$ (613,269)