Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 67,300	$ 13,500
Accumulated Amortization	16,845	6,777
Net Book Value	$ 50,455	$ 6,723
Weighted Average Remaining Useful Life (in years)	3 years 10 months 24 days	2 years 6 months
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 44,830	$ 12,130
Accumulated Amortization	12,412	5,646
Net Book Value	$ 32,418	$ 6,484
Weighted Average Remaining Useful Life (in years)	4 years 1 month 6 days	2 years 6 months
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 19,598	$ 398
Accumulated Amortization	3,210	268
Net Book Value	$ 16,388	$ 130
Weighted Average Remaining Useful Life (in years)	3 years 4 months 24 days	2 years 2 months 12 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 2,872	$ 972
Accumulated Amortization	1,223	863
Net Book Value	$ 1,649	$ 109
Weighted Average Remaining Useful Life (in years)	3 years 4 months 24 days	2 years 2 months 12 days