Revenue - Deferred Revenue Balance (Details) - USD ($) $ in Thousands		Jan. 31, 2022	Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020
Revenue from Contract with Customer [Abstract]
Deferred revenue, current	[1]	$ 58,524	$ 72,263
Deferred revenue, non-current		924	2,964
Total deferred revenue		$ 59,448	$ 75,227	$ 62,310	$ 60,295

[1] Including amounts from a related party of $575 and $7,697 as of January 31, 2022 and April 30, 2021, respectively.