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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