Property, Plant, and Equipment - Summary of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	$ 32,558	$ 31,436	$ 30,073
Cost of sales
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	20,607	22,205	21,879
Research and development
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	533	529	484
Selling, marketing, and distribution
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	3,635	1,524	509
General and administrative
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	7,693	7,088	7,111
Interest expense
Depreciation and Other Amortization Expenses [Line Items]
Depreciation and amortization	$ 90	$ 90	$ 90