Convertible Preferred Shares (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 31, 2022	Apr. 30, 2022	Jan. 30, 2022	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Class of Stock [Line Items]
Convertible preferred shares, shares outstanding (in shares)		0	52,059,826	50,809,000	32,245,000	19,703,000
Conversion of preferred shares to ordinary shares (in shares)	52,059,826
Proceeds from conversion of preferred shares	$ 25.0
Conversion price (in USD per share)	$ 9.99
Convertible dividend rate	8.00%	8.00%
Series A
Class of Stock [Line Items]
Convertible preferred shares, shares outstanding (in shares)			8,313,000
Convertible preferred shares, liquidation preference per share (in USD per share)			$ 1.00
Series B
Class of Stock [Line Items]
Convertible preferred shares, shares outstanding (in shares)			8,593,000
Convertible preferred shares, liquidation preference per share (in USD per share)			$ 2.10
Series C
Class of Stock [Line Items]
Convertible preferred shares, shares outstanding (in shares)			5,245,000
Convertible preferred shares, liquidation preference per share (in USD per share)			$ 4.29
Series D
Class of Stock [Line Items]
Convertible preferred shares, shares outstanding (in shares)			20,028,000
Convertible preferred shares, liquidation preference per share (in USD per share)			$ 4.99
Series D+
Class of Stock [Line Items]
Convertible preferred shares, shares outstanding (in shares)			9,881,000
Convertible preferred shares, liquidation preference per share (in USD per share)			$ 5.81