CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK, REDEEMABLE CONVERTIBLE CLASS A-1 COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Initial Public Offering and Private Placements	Common Stock	Common Stock Initial Public Offering and Private Placements	Additional Paid-In Capital	Additional Paid-In Capital Initial Public Offering and Private Placements	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Redeemable Convertible Preferred Stock	Series G Preferred Stock	Series H Preferred Stock	Redeemable Convertible Common Class A-1 Stock
Beginning Balance, shares (in shares) at Apr. 30, 2019									34,192,000			6,667,000
Beginning Balance, Amount at Apr. 30, 2019									$ 299,965			$ 18,800
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Preferred Stock, net of issuance costs (in shares)										1,283,000	1,654,000
Issuance of Preferred Stock, net of issuance costs										$ 25,406	$ 49,836
Ending Balance, shares (in shares) at Apr. 30, 2020									37,129,000			6,667,000
Ending Balance, Amount at Apr. 30, 2020									$ 375,207			$ 18,800
Beginning Balance, shares (in shares) at Apr. 30, 2019			20,057,000
Beginning Balance, Amount at Apr. 30, 2019	$ (165,434)		$ 20		$ 58,731		$ 74	$ (224,259)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			9,530,000
Issuance of common stock	44,027		$ 10		44,017
Issuance of Class A common stock upon exercise of stock options (in shares)			1,787,000
Issuance of Class A common stock upon exercise of stock options	2,321		$ 2		2,319
Vesting of early exercised Class A common stock options	655				655
Tender offer repurchases (in shares)			(164,000)
Tender offer repurchases	(3,548)		$ (1)		(3,547)
Stock-based compensation expense	8,310				8,310
Other comprehensive income (loss)	350						350
Net loss	(69,378)							(69,378)
Ending Balance, shares (in shares) at Apr. 30, 2020			31,210,000
Ending Balance, Amount at Apr. 30, 2020	(182,697)		$ 31		110,485		424	(293,637)
Increase (Decrease) in Temporary Equity [Roll Forward]
Repayment of Shareholder Loan									$ 24,546
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)									(37,129,000)			(6,667,000)
Conversion of redeemable convertible preferred stock to common stock upon initial public offering									$ (399,753)			$ (18,800)
Ending Balance, shares (in shares) at Apr. 30, 2021									0			0
Ending Balance, Amount at Apr. 30, 2021									$ 0			$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repayment of Shareholder Loan	1,457				1,457
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)			43,796,000
Conversion of redeemable convertible preferred stock to common stock upon initial public offering	$ 418,553		$ 44		418,509
Issuance of common stock (in shares)				21,396,000
Issuance of common stock		$ 844,575		$ 21		$ 844,554
Issuance of Class A common stock upon exercise of stock options (in shares)	5,799,000		5,765,000
Issuance of Class A common stock upon exercise of stock options	$ 10,717		$ 6		10,711
Vesting of early exercised Class A common stock options	2,869				2,869
Stock-based compensation expense	21,740				21,740
Other comprehensive income (loss)	(343)						(343)
Net loss	(55,696)							(55,696)
Ending Balance, shares (in shares) at Apr. 30, 2021			102,167,000
Ending Balance, Amount at Apr. 30, 2021	$ 1,061,175		$ 102		1,410,325		81	(349,333)
Ending Balance, shares (in shares) at Apr. 30, 2022									0			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of stock options (in shares)	4,651,000		4,515,000
Issuance of Class A common stock upon exercise of stock options	$ 21,410		$ 5		21,405
Vesting of early exercised Class A common stock options	2,745				2,745
Vesting of restricted stock units (in shares)			264,000
Repurchase and retirement of Class A common stock (in shares)			(721,000)
Repurchase and retirement of Class A common stock	(15,000)		$ (1)		(14,999)
Stock-based compensation expense	113,441				113,441
Other comprehensive income (loss)	(2,229)						(2,229)
Net loss	(192,065)							(192,065)
Ending Balance, shares (in shares) at Apr. 30, 2022			106,225,000
Ending Balance, Amount at Apr. 30, 2022	$ 989,477		$ 106		$ 1,532,917		$ (2,148)	$ (541,398)