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Net Sales - Breakdown of Export Net Sales (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Concentration Risk [Line Items]
Net sales	$ 1,059,195	$ 529,618	$ 481,336
Europe
Concentration Risk [Line Items]
Net sales	5,742	6,280	9,724
Asia
Concentration Risk [Line Items]
Net sales	7,255	6,022	3,441
Latin America
Concentration Risk [Line Items]
Net sales	4,473	2,284	3,105
All others international
Concentration Risk [Line Items]
Net sales	4,382	5,129	10,012
Total International
Concentration Risk [Line Items]
Net sales	$ 21,852	$ 19,715	$ 26,282

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