Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 144,894	$ 101,106	$ 273,764	$ 190,816
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	80,241	57,501	152,035	106,463
Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 64,653	$ 43,605	$ 121,729	$ 84,353