Revenue - Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Change In Contract With Customer, Liability [Roll Forward]
Beginning Balance	$ 75,227	$ 60,295
Performance obligations satisfied during the period that were included in the deferred revenue balance at the beginning of the year	(68,787)	(53,086)
Increases due to invoicing prior to satisfaction of performance obligations	53,008	55,101
Ending Balance	$ 59,448	$ 62,310