Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 427,620	$ 271,653	$ 159,935
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	241,648	155,935	97,006
Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 185,972	$ 115,718	$ 62,929