Ordinary Shares - Additional Information (Details)	3 Months Ended
Oct. 31, 2020 USD ($) vote shares	Apr. 30, 2020 shares
Class of Stock [Line Items]
Common stock, voting rights, number of votes per share \| vote	1
Dividends declared \| $	$ 0
Convertible Preference Shares
Class of Stock [Line Items]
Convertible preference shares authorized (in shares)	165,000,000	165,000,000
Convertible preference shares issued (in shares)	0	0
Convertible preference shares outstanding (in shares)	0	0

Common Stock, Voting Rights, Number Of Votes Per Share

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