Fair Value Measurement - Summary of Fair Value Hierarchy Classified Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Apr. 30, 2025
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. treasury securities	$ 217,484
Recurring Basis \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market funds	22,146
Total assets	22,146
Recurring Basis \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. treasury securities	195,338
Total assets	195,338
Recurring Basis \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrant liabilities	1,369	$ 8,097
Total liabilities	$ 1,369	$ 8,097

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant