Property, Plant, and Equipment - Summary of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Property Plant And Equipment [Line Items]
Depreciation and amortization		$ 16,967	$ 19,826	$ 23,909
Cost of Sales
Property Plant And Equipment [Line Items]
Depreciation and amortization		1,299	1,016	1,837
Research and Development
Property Plant And Equipment [Line Items]
Depreciation and amortization		203	43	83
Selling, Marketing, and Distribution Expenses
Property Plant And Equipment [Line Items]
Depreciation and amortization		510	114	175
General and Administrative
Property Plant And Equipment [Line Items]
Depreciation and amortization	[1]	$ 14,955	$ 18,653	$ 21,814

[1] General and administrative expenses included $14.4 million, $16.8 million, and $18.6 million of amortization for the fiscal years ended April 30, 2022, 2021, and 2020, respectively, which were recorded as a result of our acquisitions.