Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Ordinary Shares	Treasury Shares	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Apr. 30, 2020			82,856,978
Beginning balance at Apr. 30, 2020	$ 413,647	$ 367	$ 856	$ (369)	$ 898,788		$ (1,377)	$ (484,251)	$ 367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares upon exercise of stock options (in shares)			6,989,222
Stock Issued During Period, Value, Stock Options Exercised	77,258		$ 83		77,175
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering (in shares)			687,785
Stock Issued During Period, Value, Conversion of Convertible Securities	0		$ 9		(9)
Stock-based compensation	93,018				93,018
Net loss	(129,434)							(129,434)
Foreign currency translation	(6,728)						(6,728)
Ending balance (in shares) at Apr. 30, 2021			90,533,985
Ending balance at Apr. 30, 2021	450,831		$ 948	(369)	1,071,675		(8,105)	(613,318)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of ordinary shares upon exercise of stock options (in shares)			2,563,287
Reclassification of liability-classified awards	2,703				2,703
Stock Issued During Period, Value, Stock Options Exercised	36,410		$ 29		36,381
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering (in shares)			1,077,642
Stock Issued During Period, Value, Conversion of Convertible Securities	0		$ 13		(13)
Stock-based compensation	140,799				140,799
Net loss	(203,848)							(203,848)
Foreign currency translation	(10,025)						(10,025)
Ending balance (in shares) at Apr. 30, 2022			94,174,914
Ending balance at Apr. 30, 2022	$ 415,433	$ 1,266	$ 990	(369)	1,250,108	$ 1,266	(18,130)	(817,166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Issuance of ordinary shares upon exercise of stock options (in shares)			1,127,036
Stock Issued During Period, Value, Stock Options Exercised	$ 17,471		$ 12		17,459
Conversion of redeemable convertible preference shares to ordinary shares upon initial public offering (in shares)			2,064,997
Stock Issued During Period, Value, Conversion of Convertible Securities	0		$ 22		(22)
Stock-based compensation	204,039				204,039
Net loss	(236,161)							(236,161)
Foreign currency translation	(1,885)						(1,885)
Ending balance (in shares) at Apr. 30, 2023			97,366,947
Ending balance at Apr. 30, 2023	$ 398,897		$ 1,024	$ (369)	$ 1,471,584		$ (20,015)	$ (1,053,327)