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Stockholders' Equity - Summary of Stock Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 8,350	$ 7,609	$ 5,683
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	615	686	648
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	340	625	77
Selling, marketing, and distribution
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,150	1,148	930
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6,245	$ 5,150	$ 4,028

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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