Redeemable Convertible Preference Shares	12 Months Ended
	Apr. 30, 2020
Equity [Abstract]
Redeemable Convertible Preference Shares	Redeemable Convertible Preference SharesThe Company previously issued redeemable convertible preference shares in one or more series, each with such designations, rights, qualifications, limitations, and restrictions.  Immediately prior to the completion of the IPO, all shares of redeemable convertible preference shares then outstanding were automatically converted into an equivalent number of ordinary shares on a one-to-one basis and their carrying amount reclassified into shareholders’ equity. As of April 30, 2020, there were no redeemable convertible preference shares issued and outstanding.