Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Income Tax Contingency [Line Items]
Valuation allowance for deferred tax assets	$ 437,497,000	$ 386,882,000
Net operating loss carryforwards	537,912,000	547,590,000
Tax credits	32,271,000	31,373,000
Unrecognized tax benefits	29,625,000	22,691,000	$ 18,157,000	$ 16,622,000
Unrecognized tax benefits that would impact the effective tax rate before consideration of valuation allowance	0
Increase (decrease) related to tax positions taken in prior periods	1,553,000	1,201,000	(1,050,000)
Increase related to tax positions taken in the current period	5,381,000	3,333,000	2,585,000
Recognize penalties and interests accrued on unrecognized tax benefits (less than)	900,000	200,000	$ 200,000
Accrued interest and penalties, amount	1,300,000	400,000
Dividend withholding tax from foreign jurisdictions	5,700,000
Canada Revenue Agency
Income Tax Contingency [Line Items]
Tax credits	1,100,000
Tax Authority, Spain
Income Tax Contingency [Line Items]
Tax credits	1,400,000
Ministry of the Economy, Finance and Industry, France
Income Tax Contingency [Line Items]
Tax credits	600,000
Dutch | Tax and Customs Administration, Netherlands
Income Tax Contingency [Line Items]
Net operating loss carryforwards	1,407,000,000
U.S. Federal | IRS
Income Tax Contingency [Line Items]
Net operating loss carryforwards	546,300,000
Tax credits	34,600,000
U.S. Federal | Her Majesty's Revenue and Customs (HMRC)
Income Tax Contingency [Line Items]
Net operating loss carryforwards	97,900,000
U.S. State Income Tax
Income Tax Contingency [Line Items]
Net operating loss carryforwards	551,200,000
Tax credits	9,300,000
The Netherlands
Income Tax Contingency [Line Items]
Valuation allowance for deferred tax assets	390,500,000	344,500,000
United Kingdom
Income Tax Contingency [Line Items]
Valuation allowance for deferred tax assets	24,300,000	19,400,000
United States
Income Tax Contingency [Line Items]
Valuation allowance for deferred tax assets	22,700,000	$ 23,000,000.0
Cumulative earnings	825,600,000
Other countries
Income Tax Contingency [Line Items]
Cumulative earnings	$ 213,400,000