Convertible Preferred Shares - Summary of Preferred Shares Prior to Conversion (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 30, 2022	Jan. 30, 2022	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Class of Stock [Line Items]
Convertible preferred shares, shares authorized (in shares)	50,000,000	52,060,000	50,809,000
Convertible preferred shares, shares issued (in shares)	0	52,060,000	50,809,000
Convertible preferred shares, shares outstanding (in shares)	0	52,059,826	50,809,000	32,245,000	19,703,000
Convertible preferred shares, liquidation preference		$ 206,174	$ 198,912
Series A
Class of Stock [Line Items]
Convertible preferred shares, shares authorized (in shares)		8,313,000
Convertible preferred shares, shares issued (in shares)		8,313,000
Convertible preferred shares, shares outstanding (in shares)		8,313,000
Convertible preferred shares, liquidation preference per share (in USD per share)		$ 1.00
Convertible preferred shares, liquidation preference		$ 8,313
Series B
Class of Stock [Line Items]
Convertible preferred shares, shares authorized (in shares)		8,593,000
Convertible preferred shares, shares issued (in shares)		8,593,000
Convertible preferred shares, shares outstanding (in shares)		8,593,000
Convertible preferred shares, liquidation preference per share (in USD per share)		$ 2.10
Convertible preferred shares, liquidation preference		$ 18,000
Series C
Class of Stock [Line Items]
Convertible preferred shares, shares authorized (in shares)		5,245,000
Convertible preferred shares, shares issued (in shares)		5,245,000
Convertible preferred shares, shares outstanding (in shares)		5,245,000
Convertible preferred shares, liquidation preference per share (in USD per share)		$ 4.29
Convertible preferred shares, liquidation preference		$ 22,500
Series D
Class of Stock [Line Items]
Convertible preferred shares, shares authorized (in shares)		20,028,000
Convertible preferred shares, shares issued (in shares)		20,028,000
Convertible preferred shares, shares outstanding (in shares)		20,028,000
Convertible preferred shares, liquidation preference per share (in USD per share)		$ 4.99
Convertible preferred shares, liquidation preference		$ 100,000
Series D+
Class of Stock [Line Items]
Convertible preferred shares, shares authorized (in shares)		9,881,000
Convertible preferred shares, shares issued (in shares)		9,881,000
Convertible preferred shares, shares outstanding (in shares)		9,881,000
Convertible preferred shares, liquidation preference per share (in USD per share)		$ 5.81
Convertible preferred shares, liquidation preference		$ 57,361