Revenue - Deferred Revenue Balance (Details) - USD ($) $ in Thousands		Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Revenue from Contract with Customer [Abstract]
Deferred revenue, current	[1]	$ 48,854	$ 72,263
Deferred revenue, non-current		288	2,964
Total deferred revenue		$ 49,142	$ 75,227	$ 60,295

[1] Including amounts from a related party of $132 and $7,697 as of April 30, 2022 and 2021, respectively.