Balance Sheet Components - Schedule of Amortization Expense For Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Total amortization of acquired intangible assets	$ 3,542	$ 1,398	$ 7,092	$ 2,060
Cost of revenue | License - self-managed
Finite-Lived Intangible Assets [Line Items]
Total amortization of acquired intangible assets	347	158	693	255
Cost of revenue | Subscription - self-managed and SaaS
Finite-Lived Intangible Assets [Line Items]
Total amortization of acquired intangible assets	1,762	861	3,525	1,397
Sales and marketing
Finite-Lived Intangible Assets [Line Items]
Total amortization of acquired intangible assets	$ 1,433	$ 379	$ 2,874	$ 408