Balance Sheet Components - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Oct. 31, 2020	Apr. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 67,300	$ 67,300
Accumulated Amortization	23,938	16,845
Total	$ 43,362	$ 50,455
Weighted Average Remaining Useful Life (in years)	3 years 4 months 24 days	3 years 10 months 24 days
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 44,830	$ 44,830
Accumulated Amortization	16,780	12,412
Total	$ 28,050	$ 32,418
Weighted Average Remaining Useful Life (in years)	3 years 8 months 12 days	4 years 1 month 6 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 19,598	$ 19,598
Accumulated Amortization	5,653	3,210
Total	$ 13,945	$ 16,388
Weighted Average Remaining Useful Life (in years)	2 years 10 months 24 days	3 years 4 months 24 days
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 2,872	$ 2,872
Accumulated Amortization	1,505	1,223
Total	$ 1,367	$ 1,649
Weighted Average Remaining Useful Life (in years)	2 years 10 months 24 days	3 years 4 months 24 days