Income Taxes - Summary of Reconciliation of Income Taxes Statutory Income Tax Rate to Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Dutch statutory income tax	$ (42,286)	$ (24,479)	$ (12,338)
Foreign income taxed at different rates	313	(310)	(670)
Stock-based compensation	(53,050)	(24,848)	4,669
Research and development credits	(7,771)	(2,161)	(697)
Change in valuation allowance	97,734	43,071	11,495
Deferred tax asset revaluation	1,991	11,883	1,081
Other	1,101	1,232	(164)
Total provision for income taxes	$ (1,968)	$ 4,388	$ 3,376
Dutch statutory income tax, percentage	25.00%	25.00%	25.00%
Foreign income taxed at different rates (in percentage)	(0.20%)	0.30%	1.40%
Stock-based compensation (in percentage)	31.40%	25.30%	(9.40%)
Research and development credits (in percentage)	4.60%	2.20%	1.40%
Change in valuation allowance (in percentage)	(57.80%)	(44.00%)	(23.30%)
Deferred tax asset revaluation (in percentage)	(1.20%)	(12.10%)	(2.20%)
Other (in percentage)	(0.60%)	(1.20%)	0.30%
Provision for income taxes (in percentage)	1.20%	(4.50%)	(6.80%)

Effective income tax rate reconciliation, revaluation of deferred tax asset, percent.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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