Revenue - Disaggregated Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 58,263	$ 41,341	$ 110,669	$ 81,824
North America
Disaggregation of Revenue [Line Items]
Total revenue	43,697	27,807	80,149	56,612
Europe, the Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenue	12,789	12,528	25,008	22,781
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,777	$ 1,006	$ 5,512	$ 2,431
United States \| Revenue \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Geographic concentration risk, percentage	75.00%	66.00%	72.00%	68.00%
France \| Revenue \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Geographic concentration risk, percentage	12.00%	13.00%	12.00%	12.00%

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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