Revenue - Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
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	(56,926)	(42,312)
Increases due to invoicing prior to satisfaction of performance obligations	54,580	63,973
Ending Balance	$ 72,881	$ 81,956