CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	RSUs	Common Stock	Common Stock RSUs	Additional Paid-In Capital	Additional Paid-In Capital RSUs	Accumulated Other Comprehensive Income	Accumulated Deficit
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 (in shares)			1,309
Issuance of Class A common stock upon exercise of stock options	4,653		$ 1		4,652
Vesting of early exercised Class A common stock options	1,006				1,006
Shares withheld related to net share settlement of equity awards(in shares)			(437)
Shares withheld related to net share settlement of equity awards	(6,940)		$ (1)		(6,939)
Vesting of restricted stock units (in shares)				6,535
Vesting of restricted stock units		$ 23,930		$ 7		$ 23,923
Issuance of Class A common stock under employee stock purchase plan (in shares)			311
Issuance of Class A common stock under employee stock purchase plan	3,093				3,093
Stock-based compensation expense	181,522				181,522
Other comprehensive income (loss)	1,763						1,763
Net loss	(268,839)							(268,839)
Ending Balance, shares (in shares) at Apr. 30, 2023			113,943
Ending Balance, Amount at Apr. 30, 2023	$ 929,665		$ 113		1,740,174		(385)	(810,237)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of stock options (in shares)	3,033		3,028
Issuance of Class A common stock upon exercise of stock options	$ 13,710		$ 3		13,707
Vesting of early exercised Class A common stock options	507				507
Shares withheld related to net share settlement of equity awards(in shares)			(376)
Shares withheld related to net share settlement of equity awards	(13,220)				(13,220)
Vesting of restricted stock units (in shares)				6,248
Vesting of restricted stock units		34,833		$ 6		34,827
Issuance of Class A common stock under employee stock purchase plan (in shares)			863
Issuance of Class A common stock under employee stock purchase plan	10,764		$ 1		10,763
Stock-based compensation expense	176,968				176,968
Other comprehensive income (loss)	(178)						(178)
Net loss	(279,696)							(279,696)
Ending Balance, shares (in shares) at Apr. 30, 2024			123,706
Ending Balance, Amount at Apr. 30, 2024	$ 873,353		$ 123		1,963,726		(563)	(1,089,933)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of stock options (in shares)	3,425		3,425
Issuance of Class A common stock upon exercise of stock options	$ 20,416		$ 3		20,413
Vesting of early exercised Class A common stock options	259				259
Shares withheld related to net share settlement of equity awards(in shares)			(338)
Shares withheld related to net share settlement of equity awards	(9,079)				(9,079)
Vesting of restricted stock units (in shares)				6,448
Vesting of restricted stock units		$ 41,001		$ 6		$ 40,995
Issuance of Class A common stock under employee stock purchase plan (in shares)			697
Issuance of Class A common stock under employee stock purchase plan	10,880		$ 1		10,879
Stock-based compensation expense	189,091				189,091
Other comprehensive income (loss)	1,084						1,084
Net loss	(288,702)							(288,702)
Ending Balance, shares (in shares) at Apr. 30, 2025			133,938
Ending Balance, Amount at Apr. 30, 2025	$ 838,303		$ 133		$ 2,216,284		$ 521	$ (1,378,635)