CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK, REDEEMABLE CONVERTIBLE CLASS A-1 COMMON STOCK AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Redeemable Convertible Preferred Stock	Redeemable Convertible A-1 Common Stock
Beginning Balance, shares (in shares) at Apr. 30, 2020						37,129,000	6,667,000
Beginning Balance, Amount at Apr. 30, 2020						$ 375,207	$ 18,800
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 Jan. 31, 2021						0	0
Ending Balance, Amount at Jan. 31, 2021						$ 0	$ 0
Beginning Balance, shares (in shares) at Apr. 30, 2020		31,210,000
Beginning Balance, Amount at Apr. 30, 2020	$ (182,697)	$ 31	$ 110,485	$ 424	$ (293,637)
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 upon initial public offering and private placements, net of underwriting discounts (in shares)		21,396,000
Issuance of common stock upon initial public offering and private placements, net of underwriting discounts	844,646	$ 21	844,625
Issuance of Class A common stock upon exercise of stock options, net of repurchases (in shares)		4,530,000
Issuance of Class A common stock upon exercise of stock options, net of repurchases	7,867	$ 5	7,862
Vesting of early exercised Class A common stock options	2,073		2,073
Stock-based compensation expense	14,270		14,270
Other comprehensive loss	(411)			(411)
Net loss	(31,646)				(31,646)
Ending Balance, shares (in shares) at Jan. 31, 2021		100,932,000
Ending Balance, Amount at Jan. 31, 2021	1,074,112	$ 101	1,399,281	13	(325,283)
Beginning Balance, shares (in shares) at Oct. 31, 2020						37,129,000	6,667,000
Beginning Balance, Amount at Oct. 31, 2020						$ 399,753	$ 18,800
Increase (Decrease) in Temporary Equity [Roll Forward]
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 Jan. 31, 2021						0	0
Ending Balance, Amount at Jan. 31, 2021						$ 0	$ 0
Beginning Balance, shares (in shares) at Oct. 31, 2020		32,981,000
Beginning Balance, Amount at Oct. 31, 2020	(184,327)	$ 33	124,009	62	(308,431)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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 upon initial public offering and private placements, net of underwriting discounts (in shares)		21,396,000
Issuance of common stock upon initial public offering and private placements, net of underwriting discounts	844,646	$ 21	844,625
Issuance of Class A common stock upon exercise of stock options, net of repurchases (in shares)		2,759,000
Issuance of Class A common stock upon exercise of stock options, net of repurchases	4,803	$ 3	4,800
Vesting of early exercised Class A common stock options	749		749
Stock-based compensation expense	6,589		6,589
Other comprehensive loss	(49)			(49)
Net loss	(16,852)				(16,852)
Ending Balance, shares (in shares) at Jan. 31, 2021		100,932,000
Ending Balance, Amount at Jan. 31, 2021	1,074,112	$ 101	1,399,281	13	(325,283)
Beginning Balance, shares (in shares) at Apr. 30, 2021						0	0
Beginning Balance, Amount at Apr. 30, 2021						$ 0	$ 0
Ending Balance, shares (in shares) at Jan. 31, 2022						0	0
Ending Balance, Amount at Jan. 31, 2022						$ 0	$ 0
Beginning Balance, shares (in shares) at Apr. 30, 2021		102,167,000
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)	4,174,000	4,064,000
Issuance of Class A common stock upon exercise of stock options, net of repurchases	$ 19,818	$ 4	19,814
Vesting of early exercised Class A common stock options	2,391		2,391
Vesting of restricted stock units (in shares)		54,000
Stock-based compensation expense	77,813		77,813
Other comprehensive loss	(877)			(877)
Net loss	(133,645)				(133,645)
Ending Balance, shares (in shares) at Jan. 31, 2022		106,285,000
Ending Balance, Amount at Jan. 31, 2022	1,026,675	$ 106	1,510,343	(796)	(482,978)
Beginning Balance, shares (in shares) at Oct. 31, 2021						0	0
Beginning Balance, Amount at Oct. 31, 2021						$ 0	$ 0
Ending Balance, shares (in shares) at Jan. 31, 2022						0	0
Ending Balance, Amount at Jan. 31, 2022						$ 0	$ 0
Beginning Balance, shares (in shares) at Oct. 31, 2021		104,871,000
Beginning Balance, Amount at Oct. 31, 2021	1,026,510	$ 105	1,470,176	(240)	(443,531)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock upon exercise of stock options, net of repurchases (in shares)		1,397,000
Issuance of Class A common stock upon exercise of stock options, net of repurchases	8,324	$ 1	8,323
Vesting of early exercised Class A common stock options	483		483
Vesting of restricted stock units (in shares)		17,000
Stock-based compensation expense	31,361		31,361
Other comprehensive loss	(556)			(556)
Net loss	(39,447)				(39,447)
Ending Balance, shares (in shares) at Jan. 31, 2022		106,285,000
Ending Balance, Amount at Jan. 31, 2022	$ 1,026,675	$ 106	$ 1,510,343	$ (796)	$ (482,978)