Segment Information - Schedule of Property and Equipment, Net of Depreciation (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 40,543	$ 5,448
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	30,373	3,219
The Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	3,529	1,769
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	5,854	251
Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 787	$ 209